Giúp em câu này với ạ Giải thích giùm em với ạ !!! They were fortunate enough.....from the fire before the building collapsed. A. Rescuing B. To have rescued C. To have been rescued D. To rescue

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mọi người làm hộ em cái, vừa làm mấy bài lớp 7 (em học trước :>) dài mấy trang mỏi tay quá bỗng nhiên cô lại gửi cái đề này nữa :( B. Bài tập chuyển đổi thì hiện tại hoàn thành sang quá khứ đơn 1) This is the first time he went abroad.
 =>He hasn't................................................................................ 2) She started driving 1 month ago.
 =>She has.................................................................................. 3) We began eating when it started to rain.
 =>We have................................................................................. 4) I last had my hair cut when I left her.
 =>I haven't.................................................................................. 5) The last time she kissed me was 5 months ago.
 =>She hasn't............................................................................... 6) It is a long time since we last met.
 =>We haven't............................................................................. 7) When did you have it ?
 =>How long ............................................................................?
 8) This is the first time I had such a delicious meal .
 =>I haven't.............................................................................. 9) I haven't seen him for 8 days.
 =>The last .............................................................................
 10) I haven't taken a bath since Monday.
 =>It is ...................................................................................... 11) Samuel started keeping a diary in 1997 Samuel has __________________________ 12)We started learning English fìve years ago. We have ______________________________ 13) I began living in Ho Chi Minh City when I was 8. I have __________________________________ 14) She has taught the children in this remote village for five months She started _________________________________ 15) He has written to me since April. The last time ________________________________ 16) She hasn’t had a swim for five years She last ________________________________ 17) They last talked to each other two months ago They haven’t ________________________________ 18) The last time she saw her elder sister was in 1999 She hasn’t ________________________________ 19) She hasn’t written to me for years It’s years _______________________________ 20) Robert and Catherine have been married for ten years. It’s ten years _______________________________