题目内容
________ many times, they succeeded ________ experiment.
[ ]
A.Having tried; in doing
B.Tried; in being done
C.Having tried; to do
D.Tried; doing
答案:D
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题目内容
________ many times, they succeeded ________ experiment.
[ ]
A.Having tried; in doing
B.Tried; in being done
C.Having tried; to do
D.Tried; doing