问题补充:
--- She cannot her purse .
--- Yes, she doesn’t know.
A. look for, what she can do it
B. find, what to do it
C. look for, how to do
D. find, what to do
答案:
A. look for, what she can do it
B. find, what to do it
C. look for, how to do
(答案→)D. find, what to do
解析:look for和find都表示寻找,而look for强调动作,find强调结果,what+动词不定式作know的宾语,构成一个固定短语。