单项选择题

Clothing made of plastic fibres has certain advantages over ______ made of natural fibres like cotton, wool, or silk.

A．one
B．the one
C．that
D．what
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单项选择题
We'll ______ you as soon as we have any further information.
A．notify
B．signify
C．communicate
D．impart
单项选择题
Our civilization cannot be thought of as ______ in a short period of time.
A．to have been created
B．to be created
C．having been created
D．being created
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