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Years ago we didn't know this, but recent science that people who don't sleep we

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Years ago we didn't know this, but recent science that people who don't sleep we

Years ago we didn't know this, but recent science ________ that people who don't sleep well soon get ill.

A.showed

B.will show

C.has shown

D.is showing

试题答案

C

解析：由于we didn't know this与“现代科技已经证明睡不好觉的人会生病”相互对比，所以this 即指后文的内容，用现在完成时表示对现在的影响．

命题立意：本题考查时态．

标签：sciencerecentbutwhopeople

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