---- There is a lot of smoke coming out of the teaching-building there.
---- Really? It _____ be a fire, most probably.
A.can | B.ought to | C.have to | D.must |
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---- There is a lot of smoke coming out of the teaching-building there.
---- Really? It _____ be a fire, most probably.
A.can | B.ought to | C.have to | D.must |