It is quite obvious _____ has caused the traffic jam during the rush hour recentlyA.thatB.whenC.whatD.how选哪个?为什么?

分类: 作业答案 • 2022-01-04 12:11:28

问题描述：

It is quite obvious _____ has caused the traffic jam during the rush hour recently
A.that
B.when
C.what
D.how
选哪个?为什么?

答