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问题: 一道关于whether和if英语选择题

It worried me a lot _______ I would pass the exam.
A. whether B. if C. that D. when
是选B,但为什么不选A?

解答:

It worried me a lot ___A____ I would pass the exam.
A. whether B. if C. that D. when
weather,if,当是否解时,只有在宾语从句中二者可以互换,其余都用weather,当如果解时用if I don't know if/whether he will come. If he comes, I'll let you know.