题目内容
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 |
D
解析
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题目内容
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 |
D
解析