1.Tom played computer games___________.
A.before he was doing the homework
B.while he did the homework
C.by the time he has done the homework
D.after he had done the homework
2.Mary said: "If it rain, I will go on foot."
----) Mary said
3.He has......(volunteer) to help the door in the mountainous area for 3 years.
Nhớ gt rõ câu cho mk nha YÊU
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Sinh Học lớp 12
