I am sure Mary has been here and _.A.did what required her B.has done what required her C.has done what was required of her D.did what has been required of her为啥选C啊

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IamsureMaryhasbeenhereand_.A.didwhatrequiredherB.hasdonewhatrequiredherC.hasdonewhatwasrequiredofher

I am sure Mary has been here and _.A.did what required her B.has done what required her C.has done what was required of her D.did what has been required of her为啥选C啊
I am sure Mary has been here and _.A.did what required her B.has done what required her C.has done what was required of her D.did what has been required of her
为啥选C啊

I am sure Mary has been here and _.A.did what required her B.has done what required her C.has done what was required of her D.did what has been required of her为啥选C啊
首先,这个是并列举and连接的,前后时态一致,即排除掉A和D
其次她是被要求的,因此用被动语态就选C咯·
一般过去时的被动语态 was/were + done（动词过去分词）
希望帮到你

and一般连接两个相同时态，AD排除
require 可以用 what she was required 没有这项
就用be required of Somebody

被动语态，过去完成时，选C，希望能帮到你！

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