问题
选择题
——Why couldn’t they catch the 6:30 train ?
——Because they were delayed by .
A．some heavy traffics
B．heavy traffic
C．a heavy traffic
D．any heavy traffic
答案
答案：B
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——Why couldn’t they catch the 6:30 train ?
——Because they were delayed by .
A．some heavy traffics
B．heavy traffic
C．a heavy traffic
D．any heavy traffic
答案：B