up late at night is bad for our health.
A Stays     B .Stay C. Staying
C
考查動(dòng)詞的用法。句意“晚上熬夜對(duì)健康有害!本渥尤鄙僦髡Z,而動(dòng)詞原形不能作主語;動(dòng)名詞可以作主語,作主語時(shí),謂語用單數(shù)。故選C。
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