题目内容
_____many times, they succeeded _________ the experiment.
| A.Having tried; in doing | B.Tried; in being done |
| C.Having tried; to do | D.Tried; doing |
A
解析
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题目内容
_____many times, they succeeded _________ the experiment.
| A.Having tried; in doing | B.Tried; in being done |
| C.Having tried; to do | D.Tried; doing |
A
解析