—When will you visit your friend，Zhu Mei?

—________ she returns to the city.

A. So that B. As soon as C. Unless D. Because

B 【解析】試題句意：-你什么時候去拜訪你的朋友，朱梅？- 直到她返回城市。So that 以便，以致； As soon as 一……就；Unless 除非；Because因為。所以選B。
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