“Why couldn’t they meet us at five o’clock?” “Because they were delayed by .”A. heavy traf

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(答案→)A. heavy traffic　
B. heavy traffics
C. crowded traffic
D. crowded traffics
解析：对于此题，首先要明确traffic为不可数名词，没有复数形式，故排除B和D。另外，汉语习惯说“交通拥挤”，而英语习惯上却不能用crowded 来修饰 traffic，要表示汉语的“交通拥挤”，英语通常说heavy traffic，即选A。