Ithasbeenprovedseveralnewkinds

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It has been proved ____ several new kinds of medicine____ a positive effect on the cure of H7N9.

A．which，has	B．if, has
C．that, have	D．what, have

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A．try out

B．make out

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— , Joe. You only have a cold.

A．Don’t mention it

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C．It’s hard to say

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C．Eventually

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A．flexible

B．reliable

C．confident

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