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    精英家教网 > 高中英语 > 题目详情
    I coutdn't have got to the meeting on time____________ an earlier train.
    A．if I had not caughtB．unless I had caugh
    C．if ! did not catchD．unless I caugh
    B
    if．．．not和unless有时也不能互相替换。unless不能用于“由于未发生B而发生A”的句子里，如：1 will be quite斟ad if she does not come this evening。unless常用来引导一个谈及过去的事后的想法，unless从句跟着主句，通常用破折号而不是逗号将它与主句分开。
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