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题型:单选题 题类:常考题 难易度:困难

江苏省如东中学、栟茶中学2018-2019学年高二上学期英语期末考试试卷

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
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