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【题目】How long do you think it will be ______ another e-commerce giant comes out to exceed Alibaba?

A. when B. before C. since D. until

【答案】B

【解析】

试题分析:考查连词before句型。It+be+some time+before“过多久才……”。句意:你知道要过多久才会出现另一个电子商务巨头,超越阿里巴巴。故选B。

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