2. 专升本
  3. We ______her letter last week. We don’t know what has happened to her.

We ______her letter last week. We don’t know what has happened to her.

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问题 We ______her letter last week. We don’t know what has happened to her.
选项 A、must receive
B、must have received
C、ought to receive
D、ought to have received
答案D
解析 本题测试情态动词用法。ought．to have done意为“本应该做……”。本句大意为：我们本应上星期就收到她的信，不知道她出了什么事。
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