单项选择题

The impact of this well-known book______ so far-reaching had it not been for Dr. Smith, who dared to published it.
A.might have been
B.should have been
C.might not have been
D.should not have been

A.A.might
B.should
C.might
D.should
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单项选择题
He _______ special training on acupuncture . He seems to know everything about this Chinese traditional treatment.A.should have hadB.must have hadC.could have hadD.would have had
A.A.should
B.must
C.could
D.would
单项选择题
The __________ of a language is by no means an easy topic of the country________ to investigate into.A.sourceB.resourceC.natureD.beginning
A.A.source
B.resource
C.nature
D.beginning
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