单项选择题

It's a funny ______ to make a pen with a machine in it.

A． idea
B． trouble
C． story
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单项选择题
I like the black shirt, because it is ______ of the two.
A． the nicer
B． the nicest
C． nicer
单项选择题
I won't come to the party unless Peter ______.
A． invites
B． is invited
C． will invite
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