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 （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,...