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【题目】Jack won't answer the phone if he ________ the number.

A.knewB.doesn't knowC.will knowD.knows

【答案】B

【解析】

句意:如果杰克不知道号码就不会接电话。

考查if引导的条件状语从句。knew一般过去时;doesn't know一般现在时的否定句;will know一般将来时;knows一般现在时的肯定句。if引导的条件状语从句,遵循主将从现的规则,故排除AC项;再结合前后句句意可知,这里是表达“不知道号码就不会接电话”,所以从句应为一般现在时的否定句,故排除D项,故答案为B

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