1-16why hasn't he come?( )on time,we will have to put off the trip.

问题描述:

1-16why hasn't he come?( )on time,we will have to put off the trip.
1.if he doesn't come
2.if he won't come
3.if he shouldn't come
4.if he hadn't come

主句将来时,从句用一般现在时
A