Marysaysshewillgivemeacall

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Mary says she will give me a call _______ she arrives in London.

A. as soon as B. as well as C. as much as D. as usual as

A 分析句子结构可知，此处需要一个连词来引导后面的句子。as soon as“一……就……”，引导时间状语从句，故选A。