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The  first  trials  of  Aspirin  took  place  in  1899, ____ the  company  Hoffmann  worked  for ___distributing the medicine in powder form to physicians to use with patients.

A. when; began   B. which; beginning

C. when; beginning   D. which; began

高二英语单项填空中等难度题

少年,再来一题如何?
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