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tough ____many times,tim didn't lose heart.

分类: 作业答案 • 2021-12-20 08:13:51

问题描述：

tough ____many times,tim didn't lose heart.
如题
空中填having failed.求教为什么这么填?

答

have failed 表示已经失败了很多次,though后要加动名词