______my return, I learned that my supervisor had gone to the lab and would not be back for several hours.

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问题 ______my return, I learned that my supervisor had gone to the lab and would not be back for several hours.

选项 A、For
B、In
C、On
D、To

答案C

解析 句意是,我一回来就得知我导师刚走,而且几小时后才能回来。词组on one’s return表示“某人一回来就……”,所以正确答案是C选项。
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