题目内容：
[A] The low efficiency of their operation.[B] Competition from other modes of transport.
[C] Constant complaints from passengers.
[D] The passing of the new transport act.
参考答案：
答案解析：
单选题：[A] The low efficiency of their operation.[B] Competition fr
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[B] Competition from other modes of transport.
[C] Constant complaints from passengers.
[D] The passing of the new transport act.