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
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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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