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
Your explanation is clear and ______ under discussion.
A．to the point
B．at the point
C．a case in point
D．on the point
单项选择题
One of the requirements for a fire is that the material ______ to its burning temperature.
A．is heated
B．be heated
C．will be heated
D．has been heated
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