2. 专升本
  3. (2005)I always regret not_____harder when I was young.

(2005)I always regret not_____harder when I was young.

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问题 (2005)I always regret not_____harder when I was young.
选项 A、studying
B、having studied
C、to study
D、to have been studied
答案B
解析
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