.---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 |
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.---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 |
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