1.He didn't come out until he take the new medicine.
2.When he performed on stage, his parents were seated in the stand.
3.He has been ahead of his classmates in English after he read these books.
1 Before using this drug, he has been in a coma. 2 When he was performing on stage, his parents have been seated in the stands. 3 When he read these books, he has been leading in the English class the other students on a
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