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

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

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

-Really?It ________ be a fire, most probably.

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A.can

B.ought to

C.have to

D.must

试题答案

答案:B