A number of workers ______ in front of the factory to protest against being forced to work overtime.
A.is crowded
B.have crowded
C.was crowded
D.has crowded
正确答案是B
A number of workers ______ in front of the factory to protest against being forced to work overtime.
A.is crowded
B.have crowded
C.was crowded
D.has crowded
正确答案是B