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问题: 英语

The reason ____ I plan to go is ____ she will be disappointed _____ I don't.
A.why,because,when B.why,that,whether
C.because,that,if D.why,that,if

选D,但B为什么不可以呢?

解答:

if是如果的意思,用if句子就符合英语的习惯及逻辑关系了,并且否定句只能用if不用whether.