单项选择题

You ______ lead a horse to the water but you ______ not make it drink.

A. will; can
B. may; can
C. may; dare
D. dare; can
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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
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
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