______ my return, I learned that Professor Smith had been at the museum and would not be back for several hours.

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问题 ______ my return, I learned that Professor Smith had been at the museum and would not be back for several hours.

选项 A、At
B、With
C、On
D、During

答案C

解析 on用来指时间,表示“在……之时”,相当于at the same time of,后跟动名词或表示动作的名词,例如:On his arrival in Qingdao,he set to work in earnest.一到青岛他就认真地干了起来。而at,with和during则没有这种用法。
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