2. 外语
  3. Mr. Green ______my letter, otherwise he would have replied before now.

Mr. Green ______my letter, otherwise he would have replied before now.

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问题 Mr. Green ______my letter, otherwise he would have replied before now.
选项 A、must have received
B、must have failed to receive
C、must receive
D、must fail to receive
答案B
解析 本题测试“must+情态动词”的用法。本句的意思是：“格林先生一定是没有收到我的信，否则他早就已经回信了。”当表示对过去发生事情的肯定推断时，应该用“must have+过去分词”。例如：It must have rained last night. (昨天晚上肯定是下雨了。)所以答案应该是B。
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