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

______ 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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考研英语一

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