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

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

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

He feels he ________ something that wasn't important to his before.A did B has done C does D is done
答案是B
HAS DONE强调“到目前为止的结果”.

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。