đáp án + giải thích các bước giải :
1. They ……went………..home after they ……had finished…………… their work.
2. She said that she …..........already had seen…………………. Dr. Rice.
3. When he came to the stadium, the match …..already had began…
4. They told me they ……hadn't eaten…………………… such kind of food before.
5. He (ask) asked why we (come) came so early.
6. After they …had gone…, I ………sat……….. down and ……rested………
7. Before she ……watched………. TV, she ……had done…………. homework.
8.After taking a bath, he ……had gone…………….. to bed.
9. What .....had been..... he when he ……was…………. young?
10.It was the first time I (eer, see) had ever seen such a beautiful girl.
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