单项选择题

It is the last ______ that breaks the camel's back.

A．grass
B．leaf
C．straw
D．dust
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单项选择题
The company deferred him ______ on leave.
A．to be
B．to being
C．of being
D．from being
单项选择题
David would certainly have attended the important conference, if he ______.
A．was invited
B．had been invited
C．is to be invited
D．has been invited
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