单项选择题

The villagers were very（）for what those soldiers had done for them.

A．grateful
B．regretful
C．gradual
D．graceful

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

A．usual
B．average
C．equal
D．common
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