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Alice won’t answer the phone if she the ...

Alice won’t answer the phone if she        the number.

A. knew    B. doesn’t know    C. will know    D. didn’t know

 

B 【解析】 句意:Alice如果遇到不认识的电话号码,她是不会接的。if 引导的条件状语从句,在时态上要遵循主将从现的原则,和if 连着的句子是从句,用一般现在时。根据句意需要用一般现在时的否定,所以是doesn’t know. 故选B。
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