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Years ago we didn’t know this, but recen...

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

A. showed    B. has shown    C. will show    D. is showing

 

B 【解析】句意:几年前我们不知道这一点,但最近的科学研究表明,睡不好的人很快就会生病。A. showed一般过去式; B. has shown现在完成时;C. will show一般将来时;D. is showing现在进行时。过去发生的事对现在的影响了用现在完成时,根据语境(过去不知道这个事,现在知道这个事了----睡不好的人很快就会生病。)可知用现在完成时;结合句意和语境可知选B。  
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