单选题
We ______ the letter yesterday, but it didn't arrive.
A、
must receive
B、
must have received
C、
ought to receive
D、
ought to have received
【正确答案】
D
【答案解析】
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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