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Yesterday it rained heavily when school was over. We         stay in our classroom.

A. should              B. must               C. have to               D. had to

Yesterday it rained heavily when school was over. We ________ stay in our classroom.

A. should

B. must

C. had to

Yesterday it rained heavily when school was over. We ________ stay in our classroom.

A. should

B. must

C. had to