______his return from Japan, Professor Li went directly to his laboratory and started working with his colleagues.

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问题 ______his return from Japan, Professor Li went directly to his laboratory and started working with his colleagues.

选项 A、Upon
B、At
C、Within
D、Over

答案A

解析 本句意为“李教授一从日本回国就立刻进入实验室开始与同事们一起工作”。“upon(on)+表示行为的名词”相当于as soon as引导的时间状语从句。
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