单项选择题

______, liquids can be changed into gases.

A．Heating
B．To be heated
C．Heated
D．Heat
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单项选择题
She______.
A．mustn't have hurried
B．couldn't have hurried
C．must not hurry
D．needn't have hurried
单项选择题
The chair looks rather hard, but in fact it is very comfortable to ______.
A．sit
B．sit on
C．be seat
D．be sat on
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