单项选择题

_______ is often the case with a new idea, much preliminary activity and optimistic discussion produce no concrete proposals.

A．As
B．That
C．Which
D．What
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单项选择题
The introduction of fabrics made from rayon, nylon and other _______ fibers has made many changes in our civilization.
A．manufactured
B．artificial
C．synthetic
D．manned
单项选择题
He is too weak to _______ his business.
A．do with
B．do without
C．do away with
D．do up
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