题目内容
.---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
B
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题目内容
.---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
B