Before testing this method on patients, Dr. Baker had tests for two yearson three hundred

发布时间：2020-08-16 12:21:49


Before testing this method on patients, Dr. Baker had         tests for two years
on three hundred dogs.
A. found out
B. helped out
C. worked out
D. carried out

网友回答

A. found out
B. helped out
C. worked out
(答案→)D. carried out
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