We must have received the letter yesterday, but it didn’t arrive.

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问题 We must have received the letter yesterday, but it didn’t arrive.

选项

答案must——should

解析 must have done是肯定推测，但根据句意应当是“我们本该昨天就收到信，但至今仍没有收到”，故应当用should have done，表示“本应该”。

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