A 21.—What can I do for you,Madam?

问题描述:

A 21.—What can I do for you,Madam?
—No,thanks.I ________.
A.just look for someone B.am just looking around
C.can do it myself D.just wait for a friend
A....

am just looking around 有两个谓语动词,不对
can do it myself 不符合语境
just wait for a friend 如用waiting 就对了