Question

(河南省2006)

--- I don't know ________ with this problem. It's too hard.

--- You can ask Mr Wang for help.

[　　]

A．which to do

B．when to do

C．what to do

D．how to do

Answer 1

答案：D
解析：

解析：本題考查動(dòng)詞不定式的復(fù)合結(jié)構(gòu)。其結(jié)構(gòu)為“疑問(wèn)詞＋不定式”，A、B、C三項(xiàng)從語(yǔ)法上看都正確，但根據(jù)答語(yǔ)可知回答的是how (怎么樣) 問(wèn)句。故選D。