2. 外语
  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、On
C、With
D、During
答案B
解析 该题是词汇题，考查介词与名词的搭配。介词on后面跟名词或动名词表示“就在……之后、一……就……”。如：On arriving home I discovered they had gone．我一到家就发现他们已经离开了。／Please report to reception on arrival．到达后请立即到接待处报到。其他几个介词不能这么使用。因此，根据题意，选项B为最佳答案。
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