问题

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

正确答案是：

同类题型

Some of you may have finished unit one. _____, you can go on to unit two. [ ]

You look so tired. Why ____________ to have a rest — OK, thanks.

She was disappointed to find her suggestion _________.

Hello，Jane，have you arrived at the hotel?—–Yeah，busy.I’ll call back later.

The firemen _____ the fire in the end.