With online course Crazy English owns over 20 million students all over China ________ the class through the Intemet.
A.attendB.attendedC.attendingD.to be attending在线课程C
解析：
主句中已有谓语动词owns，该空就不可能以谓语动词的形式出现，排除A项；“上课”是由学生们发出的主动的动作，排除使用过去分词的B项；不定式作定语表示的是将来的动作，而主句中表示的是当前的情况，排除D项。attending是现在分词作定语，表示主动的动作和目前正在发生的动作。
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