The student asked the teacher ( ) to turn to for information about the subject and the teacher told him he could use the

问题描述:

The student asked the teacher ( ) to turn to for information about the subject and the teacher told him he could use the Internet.
A.WHO B.WHERE C.WHAT D.HOW
为什么不能选D

what 后直接加 to do
而 how 后要加 to do it
这里没有it
所以选C.