He wanted to know____

问题描述:

He wanted to know____
A;whether he speaks at the meeting
B.when the meeting would start
C.what he's going to do at the meeting
D.where would the meeting be held
为什么要选B?

连词之后加主语,所以可以排除D,
whether之后有肯定和否定,A没有否定,排除A
what是什么的意思,整句意思不通顺,排除C
选B