The next thing ( ) must be done is to make a planA.which B.that C.when D./我能明白能用that但不能用which,但是为什么不能选择D呢?
问题描述：
The next thing ( ) must be done is to make a plan
A.which B.that C.when D./
我能明白能用that但不能用which,但是为什么不能选择D呢?
答
must be done 是一个定语从句,从句中缺少主语,不能选d