单项选择题

It is required that such insulator (绝热体) ______ a heat resistant material.

A．must be made of
B．should be made of
C．will be made of
D．would be made of
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单项选择题
The paint is still wet, ______!
A．Be not sure to touch it
B．Be sure not to touch it
C．Be sure to not touch it
D．Don't be sure to touch it
单项选择题
Jenny didn't have time to go to concert last night because she was busy ______ for her examination.
A．preparing
B．to be prepared
C．to prepare
D．being prepared
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