I missed the last bus so I go home on foot.A. must B. have toC. may D. had to

问题补充：

I missed the last bus, so I go home on foot.

A. must

B. have to

C. may

D. had to

答案：

A. must

B. have to

C. may

(答案→)D. had to

解析：have to表示客观上要求做某事，must表示主观上认为必须做某事。