问题
I posted the letter a week ago. — Then they________the letter by now. It usually takes four days.[ ]
A: can have received
B: must have received
C: would have received
D: should have received
B: must have received
C: would have received
D: should have received
正确答案是：
同类题型
The paper box is ______ as that one.
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We sat on the dry grass our backs to the wall , chatting cheerfully