单项选择题

He _______ special training on acupuncture . He seems to know everything about this Chinese traditional treatment.
A.should have had
B.must have had
C.could have had
D.would have had

A.A.should
B.must
C.could
D.would
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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
单项选择题
It was 40 days later that the rebels in the boundary areas of the country______ to the authorities.A.negotiatedB.overcameC.descendedD.surrendered
A.A.negotiated
B.overcame
C.descended
D.surrendered
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