Be careful __ the cars and buses when you walk in the street

问题描述:

Be careful __ the cars and buses when you walk in the street
A.at
B.for
C.on
D.of

选D be careful of 后接名词 the cars 当然是名词啦 也就是说
当你在街上走的时候,要小心汽车和公交车