The teacher won't explain___makes his students so fascinated with his lessons.

问题描述:

The teacher won't explain___makes his students so fascinated with his lessons.
A.what it is that B.that what it is C.what is it that D.that what is it

选A,名词性从句,C,D可以直接排除,从句应该用陈述句语序;The teacher won't explain (that)what it is that makes his students so fascinated with his lessons.这个是完整的句子,第一个that 可以省略,第二个省略的...