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if/whether 是否 I wonder if he is at home. I ask him whether he would come. 注意：只可以用whether的情况 介词后面 It will depend on whether it rains tomorrow. whether···or not 固定搭配 Let me know whether you come or not. 动词不定式前 I don’t know whether to accept his advice. (责任编辑：admin) |