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-There is a lot of smoke coming out of the teaching building. -Really? It be a f

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-There is a lot of smoke coming out of the teaching building. -Really? It be a f

—There is a lot of smoke coming out of the teaching building.

—Really? It _____be a fire, most probably.

A. can       B. ought to    C. have to       D. must

 

试题答案

B