Could _ have been _ who helped Sunny get her work done?A.they ,it B.they ,them C.it,them D.it,they 答案是 D为啥?

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Could_havebeen_whohelpedSunnygetherworkdone?A.they,itB.they,themC.it,themD.it,they答案是D为啥?Could_haveb

Could _ have been _ who helped Sunny get her work done?A.they ,it B.they ,them C.it,them D.it,they 答案是 D为啥?
Could _ have been _ who helped Sunny get her work done?
A.they ,it
B.they ,them
C.it,them
D.it,they
答案是 D
为啥?

Could _ have been _ who helped Sunny get her work done?A.they ,it B.they ,them C.it,them D.it,they 答案是 D为啥?
对强调句It is they who have helped sunny get her work done.中主语they 的提问