2. 外语
  3. I am sorry. I______finished it by last Monday, but I have been too busy.

I am sorry. I______finished it by last Monday, but I have been too busy.

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问题 I am sorry. I______finished it by last Monday, but I have been too busy.
选项 A、must have
B、may have
C、ought to have
D、might have
答案C
解析 此题测试的是情态动词完成式的含义和用法。ought to have(done)具有虚拟含义，与 should(not)have(done)类似，表示“本应该(本不该)做某事但实际上未做(做了)”，符合题意要求：“我应该上星期一前就做完这件事，可是我一直太忙了，真抱歉”；may have(done)和might have(done)“也许做了某事”，后者可能性更小；must have(done)表示对过去情况的肯定推测，均与句意不符。
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