问题描述：
冠词的用法,
Nowadays,more and more people have private cars and ____bicycles is no longer___important means of transportation.
A.the ;/ B.the ;an C.a;the D./;/
Nowadays,more and more people have private cars and ____bicycles is no longer___important means of transportation.
A.the ;/ B.the ;an C.a;the D./;/
问题解答：
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