Chuyên đề 2: Thì và sự hòa hợp của thì
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I ______ her since I _____ a student. A. know/ am B. knew/ was C. have known/ am D. have known/ was

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I ______ her since I _____ a student.

know/ am

knew/ was

have known/ am

have known/ was

Giải thích

Chọn D