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

B

【解析】

試題分析：考查連詞before句型。It+be+some time+before“過多久才……”。句意：你知道要過多久才會(huì)出現(xiàn)另一個(gè)電子商務(wù)巨頭，超越阿里巴巴。故選B。

考點(diǎn)：考查連詞before句型

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