According to the companies' websites, the number of active QQ users in China has reached 1 billion, while Qihoo 360 also claims _____

◎ 题干

According to the companies' websites, the number of active QQ users in China has reached 1 billion, while Qihoo 360 also claims ______ at least 300 million users before June 2010.

A. to have
B. to have had
C. having
D. having had

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◎ 解析

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◎ 知识点

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