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  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
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