Hurry up! They ________ for us at the cr
题型:选择题
问题:
Hurry up! They ________ for us at the crossing.[ ]
A. must wait
B. must have waited
C. must be waiting
D. may wait
Hurry up! They ________ for us at the crossing.[ ]
A. must wait
B. must have waited
C. must be waiting
D. may wait