How can we make the road safe?

问题描述:

How can we make the road safe?
How ______ be made safe?
A.can the road B.the road can
C.the road D.road can

这是一个被动的转化要原句子的宾语换为被动句的主语
那么就是A的行式
How can we make the road safe?主动
How ___can the road ___ be made safe?被动