Sorry we’re late.We couldn’t get a taxi,so we had to come __

Sorry we're late.We couldn't get a taxi,so we had to come _____ .
A.by walking
B.on foot
C.walk
D.walking
E.with feet
为什么对?其余为什么不对?

Sorry we're late.We couldn't get a taxi,so we had to come （on foot）.
抱歉我们来晚了.没打上的,所以我们得走路过来.
因为本句已经有了动词had to come做谓语,所以括号里不能再用动词,是做方式状语.
on foot,走路,这是个固定搭配的介词短语.
C和D都是动词,首先排除掉了.E的介词用错.A的by要和交通工具连用,如by bus,by bike.