We have to keep       with the changing times.
#6451
A
step
B
the pace
C
a pace
D
pace
推荐题目
He dropped the ______ and broke it.
#5441
A
cup of coffee
B
coffee’s cup
C
cup for coffee
D
coffee cup
“Why couldn’t they meet us at five o’clock?” “Because they were delayed by ________.”
#7317
A
heavy traffic 
B
heavy traffics
C
crowded traffic
D
crowded traffics