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With online course Crazy English has over 20 million students all over China          the class through the Internet .

   A. attend B. attended    C. attending   D. to be attending

C


解析:

本题考查have sb do/doing;have sth done的用法区别。have sb do 让某人做某事,have sb doing,让某人处于某种状态,have sth done让别人做某事。故选C。

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