The scientists ________ on the new medicine for two years.Th
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The scientists __C__have worked____ on the new medicine for two years.They will succeed in no time

从状语for two years可见,此处用完成时

2.A:____C.How soon____ will we know the results of the test?

B:In a week,I suppose.

从答语 In a week " 一周以后” 可见,问句应该是“还要多久.”How soon

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