When you go outing with your sisters,you must see to _____ that they are safe.
问题描述：
When you go outing with your sisters,you must see to _____ that they are safe.
A.everything B.it C.them D.yourself
为什么选B不能选A
答
B
see to it that...
see to 负责,注意,照料
由于介词to 不可以直接接that-从句,故用it 过渡
拓展：
You can depend on it that he is honest.
他是诚实的,这点你尽管放心!为什么不能用everything啊这样后面的that 从句就挂不上了。如果没有个that从句在后， 用everything 当然没问题。