--Have you finished your paper,John?--No,I ___my
--Have you finished your paper,John?--No,I ___my
--Have you finished your paper,John?
--No,I ___my mother in the kitchen all day yesterday.
A.had helped
B.had been helping
C.have been helping
D.have helped
求详解
--Have you finished your paper,John?
--No,I ___my mother in the kitchen all day yesterday.
A.had helped
B.had been helping
C.have been helping
D.have helped
求详解
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