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【题目】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:吉姆不能来参加聚会,因为他必须帮助他的父亲。考查动词形式辨析题。must相当于have to,表示“必须,一定”,后接原形动词,可排除A。need需要,语气弱于must,不符本题语境,可排除。本题是原因状语从句,从句主语he是三单人称,动词需用三单形式,可排除C。根据句意结构,可知选B。

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