下面这句话怎么解释?The business of continuing the family lineage and keeping the bloodlines pure is often too important to be left to romance and chance encounters.句子中to be left.为什么会是to be?
问题描述：
下面这句话怎么解释?
The business of continuing the family lineage and keeping the bloodlines pure is often too important to be left to romance and chance encounters.
句子中to be left.为什么会是to be?
答
too...to 结构额
答
be important to do sth.所以用to
be 在这里是被动语态的be：be left