题目内容

【B4】

A. suspects
B. understands
C. wonders
D. convinces

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【B15】

A. to require
B. required
C. requiring
D. are required

【B6】

A. what
B. those
C. as
D. which

【B7】

A. teacher
B. classmate
C. partner
D. student

【B1】

A. extending
B. illustrating
C. performing
D. conducting

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