单项选择题

Where could my son ______the key I couldn't find anywhere.

A．put
B．have put
C．has put
D．had put
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单项选择题
I hope they ______this tall building up by the time I come back next year.
A．are to build
B．will build
C．have built
D．will have built
单项选择题
It is ______of you to go into the dark room only by yourself at midnight.
A．efficient
B．proud
C．bold
D．greedy
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