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说明为什么选This is my _____ dictionary.A sister's B sister,Mary's This is my ( )dictionary.A.sister Mary B.siter's C.sister Ma 名称所有格This is my___ dictionary.A.sister's B.sister's Mary's 40.This is my____ dictionary.A.sister Mary B.sister’s C.sist This is my ( )dictionary.A.sister Mary This is my____dictionary.A.sister Mary B.sister's C.sister,M ( ) 2 This is my____dictionary.　　A.sister Mary B.sister's C. That girl is a friend of( ) A.Mary's sister' B.Mary sister's It's _____.A.my sister's,Jenny B.my sister,Jenny's C.my sist she is my daughter.A sister B sister's C 32.mary is my aunt's daughter so she is my------.A,sister B. This is my a（ ）,Mary.She's my mother's sister.括号里面要填什么?急要!