up late at night is bad for our health. A Stays B .Stay C. Staying
题型：不详难度：来源：
up late at night is bad for our health.
A Stays B .Stay C. Staying |
答案
| C |
解析
| 考查动词的用法。句意“晚上熬夜对健康有害。”句子缺少主语，而动词原形不能作主语；动名词可以作主语，作主语时，谓语用单数。故选C。 |
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