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【单选题】

The science of medicine,progress has been very rapid lately, is perhaps the most important of all the sciences.

A.
to which
B.
in which
C.
which
D.
with which
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A.
种内斗争
B.
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A.
might
B.
need
C.
should
D.
Would
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q
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B.
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C.
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A.
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B.
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D.
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