【題目】Jim can’t come to the party, because he_____ help his father.

A. must to B. has to C. have to D. need to

【答案】B

【解析】句意：吉姆不能來參加聚會，因為他必須幫助他的父親。考查動詞形式辨析題。must相當(dāng)于have to，表示“必須，一定”，后接原形動詞，可排除A。need需要，語氣弱于must，不符本題語境，可排除。本題是原因狀語從句，從句主語he是三單人稱，動詞需用三單形式，可排除C。根據(jù)句意結(jié)構(gòu)，可知選B。

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