2. 外语
  3. ______your timely advice, I would never have known how to go about the work.

______your timely advice, I would never have known how to go about the work.

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问题 ______your timely advice, I would never have known how to go about the work.
选项 A、Unless
B、Except for
C、Not for
D、But for
答案D
解析 该题是语法结构题，考查虚拟语气在含蓄条件中的用法。在此用法中，假设的情况不是用一个条件句来表示，而是隐含在诸如without，but for，but that等引导的短语或句子中，或由连词but，副词otherwise，以及比较等级等表示的上下文中，如：But that she was afraid，she would have gone there alone．要不是因为害怕，她就独自一人去了。／A more careful person wouldn’t have made so many mistakes．=If you had been more careful，you wouldn’t have made so many mistakes．如果细心一点，就不会出这么多错误了。因此，根据题意和语法规则，选项D为最佳答案。
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