搜索结果： 分析不定式是什么成分（涉及sth is easy to do, happen to do等）1. The question is easy to answer.(to answer 做什么成分） 2. I happened to meet him in the street. 3. He seems to know the tru 质疑高考题：happen to do sth与happen 下面的句子是1988年的一道全国卷高考题： Nobody noticed the thief slip into the house because the lights happened to _______. A. put out B.
