Years ago we didn’t know this, but recent science ______ that people who don’t sleep well soon get ill.–recent 现在完成时的时间标志词语
（A）showed
（B）has shown
（C）will show
（D）is showing
参考答案
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更多大学英语单项选择题库试题
- 1The death of his sister has a great ___________ on him.
- 2Which of the following best expresses the main idea of the passage?
- 3Which of the following is NOT a result of the land-grant acts of the 1850’s?
- 4When she turned the corner, she found herself __ by a man with dark glasses.
- 5The author’s purpose of writing this passage is to______.
