题目内容
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
答案:B
解析:
解析:
|
句意:几年前我们不了解此事,但最近的科学表明,睡眠不好的人不久就会得病。主语是recent science,谓语表示“已表明了”,所以要用现在完成时。 |
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