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【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)句意結構,可知選B。

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