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
- 1His article concerning population control was published in the _____ issue of China Daily.
- 2As soon as he comes back, I’ll tell him when _______ and see him.
- 3Helen had to shout ________ above the sound of the music.
- 4— Alice came back home the day before yesterday. — Really Where ____ 前天以前她去哪儿了？用过去完成时
- 5— Has Jack finished his homework yet —I have no idea; he ____ it this morning.
