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
继续答题：下一题
更多大学英语单项选择题库试题
- 1—Tom, this is Hack, Fred is ill in hospital.–fred住院了，这是一个坏消息。 — Oh, _________→ 听者应该表示抱歉。
- 2They had a (n) _____argument for several hours without reaching an agreement.
- 3If you had wanted to buy a record, what ________?
- 4Mary is never late for class, _______ ?
- 5-- May I help you, madam -- ______________.
