问题标题:
下面这句话怎么解释?Thebusinessofcontinuingthefamilylineageandkeepingthebloodlinespureisoftentooimportanttobelefttoromanceandchanceencounters.句子中tobeleft.为什么会是tobe?
问题描述:

下面这句话怎么解释?

Thebusinessofcontinuingthefamilylineageandkeepingthebloodlinespureisoftentooimportanttobelefttoromanceandchanceencounters.

句子中tobeleft.为什么会是tobe?

戴文明回答:
  beimportanttodosth.所以用to   be在这里是被动语态的be:beleft
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