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

A. try help B. trying to help

C. tries to help D. try to help

【答案】D

【解析】

試題分析：句意：他必須設(shè)法幫助她的妹妹學(xué)數(shù)學(xué)。情態(tài)動(dòng)詞后加動(dòng)詞原形。try to do sth設(shè)法做某事。根據(jù)句意，故選D。

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