单项选择题

I appreciate ______ that letter for me.

A．you to write
B．your writing
C．you write
D．that you writing
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单项选择题
I'd like to ______ a special seat for the concert of May 5.
A．serve
B．reserve
C．preserve
D．conserve
单项选择题
______ we not helped him, he would have been hurt by the truck.
A．Had
B．Have
C．If
D．Until were
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