_______ do you know him _____?----not very well A.how well B.how C.what D.how much

_______ do you know him _____?----not very well A.how well B.how C.what D.how much
_______ do you know him _____?----not very well A.how well B.how C.what D.how much

_______ do you know him _____?----not very well A.how well B.how C.what D.how much
选D
意为：--你对他有多了解?
--不是很了解.

选A.你对他了解多少？
选D应该是How much do you know about him?

D 你了解他多少

选A
因为How well do you know him? 其中well是副词。
如果选D的话，应该是 How much do you know about him? 其中 much是名词，做宾语的。