___ it very necessary to do things on time.A.This B.It C.That D.One
问题描述：
___ it very necessary to do things on time.A.This B.It C.That D.One
答
B it is very necessary to do things on time.题干中的it应为is,形式主语.第二个为it不是is题干（题目）的第一个单词应该是is而不是it，对吧。也许吧谢谢