I visited Mr. Johnson during his stay in Shanghai _____ he attended a most important conference there.

A. when
B. which
C. where
D. in which
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科目：高中英語(yǔ) 來(lái)源：天津模擬題 題型：單選題

I visited Mr. Johnson during his stay in Shanghai _____ he attended a most important conference there.
[     ]
A. when
B. which
C. where
D. in which

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