单项选择题

He was asked to ______the pencil for the little boy.

A．sharp
B．sharped
C．sharping
D．sharpen
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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
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
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