问题

Hurry up! They ________ for us at the crossing.[ ]

A: must wait
B: must have waited
C: must be waiting
D: may wait

正确答案是：

同类题型

Computers_______ many things and we_______ these modern machines.

Jim sits behind me, so I sit ________________ him.

It may have been unusually cold recently but experts say it’s ________ for this time of year

Don’t worry about your broken pen．You can use ．

Ann is in hospital.—Oh, really I know. I go and visit her.