单项选择题

They failed to pass the exam last time. I regretted（）

A．being unable to help
B．to be not able to help
C．being not able to help
D．not be able to help

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单项选择题
The （）salary of the staff is about ＄ 50.

A．usual
B．average
C．equal
D．common
单项选择题
Your explanation is clear and （）under discussion.

A．to the point
B．at the point
C．a case in point
D．on the point
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