【題目】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：現(xiàn)在中國大約有超過7億7千萬的4G用戶，這個(gè)數(shù)目比2015年增長了一倍。double是動(dòng)詞，后面跟賓語；同時(shí)橫線處的詞在后面從句中作was的表語，根據(jù)句意，用what，故選C。

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