单项选择题

You can do it if you want to, but in my opinion it’ s not worth the______it involves.

A．effort
B．attempt
C．force
D．strength
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单项选择题
You______John in the street this morning. He’ s been dead for ages.
A．mustn’t see
B．mustn’ t have seen
C．couldn’t see
D．couldn’ t have seen
单项选择题
I need to move to a larger apartment. Do you know of any ______ one in this neighborhood
A．vacant
B．bare
C．blank
D．empty
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