单项选择题

W: In this city there are many types of transportation available. Which do you use, Fred
M: The buses are so crowded that I usually take the tram.
Why does Fred prefer to use the tram（）

A. They are faster.
B. It is the only thing available.
C. Buses are not safe.
D. Buses are too crowded.

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单项选择题

A. would not have come
B. had come
C. came
D. did come

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disappeared

W: In this city there are many types of transportation available. Which do you use, Fred M: The buses are so crowded that I usually take the tram. Why does Fred prefer to use the tram（） 您的浏览器不支持 audio 元素。