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
The smile on his face shows that he is ______ his students' work.
A．worded about
B．pleased with
C．sorry for
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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