单选题：请在（12）处填上最佳答案。

题目内容：

请在（12）处填上最佳答案。 A． categories
B． examples 　　☆考试大-在线☆考试中心T
C． patterns
D． samples

参考答案：

答案解析：

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Which course(s) runs or run for one hour each time?[A] Conversation class.[B] Wr

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