问题

Why are the lights in the teachers’ office still on—There ________ be some teachers working there.

A:can
B:must
C:may
D:ought to;

正确答案是：

同类题型

Parents like to buy toys to keep their little babies________[ ]

Tony and Rose____ from America.

In this factory, it’s hard to tell cadres ____ workers

_____your taste，you can be satisfied in thisnewly-popened restaurant

We are going to begin our meeting at 8：00.Please be here_______.Don’t be late.