He feels he ________ something that wasn't important to his before.A did B has done C does D is done

问题描述:

He feels he ________ something that wasn't important to his before.
A did B has done C does D is done

B.通过从句的时态可判断答案在AB之间。而B强调对现在的影响。

答案是B
HAS DONE强调“到目前为止的结果”.