【題目】He must ______ his sister with her math.

A. try helpB. trying to helpC. tries to helpD. try to help

【答案】D

【解析】

試題句意:他必須設法幫助她的妹妹學數(shù)學。情態(tài)動詞后加動詞原形。try to do sth設法做某事。根據(jù)句意,故選D。

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