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 题目 :
 学生

He felt very sad with a lot of problems_______.Ato solve B.to be solved这里with结构的主语是he还是problems?如果是problems不应是“被解决”吗?

 答案 :   
 
  答疑老师

答案为A。因为有很多问题要解决他感到很伤心。
solve 的动作是he发出的,故用不定式的主动语态。
又如:
With a lot of work to do, we had to be busy working day and night.
有这么多的工作要做,我们只得日夜忙碌。