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
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
单项选择题
Have you ever seen a ______ bag on the table
A. plastic small black
B. black small plastic
C. plastic black small
D. small black plastic
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