There is some doubt ______ Julia can pass her driving test tomorrow.

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问题 There is some doubt ______ Julia can pass her driving test tomorrow.

选项 A、whether
B、that
C、which
D、if

答案A

解析 whether和if都可以作连词,表示“是否”。有些情况下,两者可以互换(比如引导宾语从句时),但是当引导同位语从句时,一般只用whether而不用if。该句子就是这种情况。又例如:We have a doubt whether it is true.我们怀疑那不是真的。
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