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【题目】It is estimated that China has over 770 million 4G users, which doubles ________ it was in 2015.

A. that B. which

C. what D. how

【答案】C

【解析】句意:现在中国大约有超过7亿7千万的4G用户,这个数目比2015年增长了一倍。double是动词,后面跟宾语;同时横线处的词在后面从句中作was的表语,根据句意,用what,故选C。

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