问题描述：
How do you go to school every day?We usually go to school on ___ bus.
How do you go to school every day?
We usually go to school on ___ bus.
A:\ B:an C:the D:a
How do you go to school every day?
We usually go to school on ___ bus.
A:\ B:an C:the D:a
问题解答：
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