单项选择题

America will never again have as a nation the spirit of adventure as it ______before the west was settled.

A．could
B．would
C．was
D．did
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单项选择题
Classes will cease to exist by the time communism______ throughout the world.
A．is achieved
B．has been achieved
C．will be achieved
D．will have been achieved
单项选择题
Bacteria are sometimes______ too small to be seen without a microphone.
A．far
B．rather
C．quite
D．very
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