We ______ the letter yesterday, but it didn’t arrive.

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问题 We ______ the letter yesterday, but it didn’t arrive.

选项 A、must receive
B、must have received
C、ought to receive
D、ought to have received

答案D

解析 ought to have recieved本应该…却没有…,符合句意。must have received表示对过去的肯定猜测。
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