Question

【题目】–Millie is very hard-working.

–Yes, she is often seen _________up very late.

A. staying B. stay C. to stay D. stayed

Answer 1

【答案】C

【解析】句意：-Millie工作非常努力。-是的，经常看到她熬夜到很晚。staying呆，是现在分词形式；stay动词原形；to stay动词不定式；stayed过去分词。stay up是固定短语，熬夜，句中使用的句型是see sb. do sth.看到某人做某事，当这个句型用于被动语态的时候，在动词不定式前加上to。故应选C。