单项选择题

This kind of material can ______ heat and moisture.

A．delete
B．compel
C．constrain
D．repel
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单项选择题
I didn't ______ that these days he was especially busy.
A．pay attention to
B．notice
C．recognize
D．guess
单项选择题
This cloth is obviously ______ real silk.
A．inferior than
B．inferior to
C．inferior for
D．inferior on
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