【題目】His math is poor, you must ________ him.

A. try help B. trying to help C. try to helps D. try to help

【答案】D

【解析】

句意:他的數(shù)學很差,你必須盡力去幫助他。must是情態(tài)動詞后跟動詞原形,故排除B;try to do努力做某事;try doing嘗試做某事。根據(jù)His math is poor,因為他的數(shù)學很差,所以應(yīng)該是盡力做某事。故選D。

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