Whendidthefirsttrialsofthismedicinetakeplace? I...
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问题详情：
When did the first trials of this medicine take place ?
It was in 1899 the company began distributing the medicine in powder
form to physicians to use with patients.
A. when B. which C. that D. where
【回答】
A
知识点：强调句
题型：选择题
