单项选择题

Mary （） his letter, otherwise she would have replied before now.

A. has received
B. must receive
C. couldn’t have received
D. shouldn’t have received

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单项选择题
The plane （） at 7: 00 p. m., so I have to be at the airport by 6 : 40 at the latest.

A. has left
B. is to leave
C. will have left
D. leaves
单项选择题
You ______ to the meeting this afternoon if you have something important to do．
A．needn’t to come
B．don’t need come
C．don’t need coming
D．needn’t come
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