_________is often used to talk about rules or laws. It is stronger than have (got)to. 选择一项： a. Must b. Have to c. Have got to

_________is often used to talk about rules or laws. It is stronger than have (got)to.

选择一项：

a.
Must

b.
Have to

c.
Have got to

出自：北京开放大学大学英语（2)

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