问题
选择题
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
答案
答案：D
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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
答案：D
