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
- 1______ farming is better for the environment.
- 2There has been a ____ in fashion from formal to more informal dress.
- 3According to this passage, the sea _ is likely to have the lowest salinity.
- 4It was not tom’s ______that he was late for school, because he was delayed by a traffic accident.
- 5—It is said that another new car factory ____ now.现在进行时的标志词 — Yeah.It _______ one and a half years.-正在建，说明将要花费一年半的时间
