题目内容：
Which course(s) runs or run for one hour each time?
[A] Conversation class.
[B] Writing Skills class.
[C] Examination Skills class.
[D] All of the three courses.
参考答案：
答案解析：
单选题：Which course(s) runs or run for one hour each time?[A] Conve
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Which course(s) runs or run for one hour each time?
[A] Conversation class.
[B] Writing Skills class.
[C] Examination Skills class.
[D] All of the three courses.