Years ago we didn’ t know this, but recent science _________ that people who don

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

选项 A、showed
B、has shown
C、will show
D、is showing

答案 B

解析本题可利用时态标志解题。本句的时态标志为Years ago和recent, 虽然“以前不知道”,但“现在已经证明了”,所以用现在完成时。因此B项符合题意。句意:几年前，我们还不知道这一点，但最近的科学表明，睡眠不好的人很快就会生病,故选B。

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