单项选择题

It is no ______ asking him to come now. He is busy.

A. use
B. excuse
C. useless
D. point
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单项选择题
Our company decided to ______ the contract because a number of the conditions in it had not been met.
A. destroy
B. resist
C. assume
D. cancel
单项选择题
Although they plant trees in this area every year, the tops of some hills are still
A. blank
B. hollow
C. vacant
D. bare
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