选出错误的选项并加以改正( )On Christmas Day ,they were in their grandparent's house.—— ————— —— ——————A.B.C.D.

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选出错误的选项并加以改正( )On Christmas Day ,they were in their grandparent's house.—— ————— —— ——————A.B.C.D.

选出错误的选项并加以改正( )On Christmas Day ,they were in their grandparent's house.—— ————— —— ——————A.B.C.D.
选出错误的选项并加以改正
( )On Christmas Day ,they were in their grandparent's house.
—— ————— —— ——————
A.B.C.D.

选出错误的选项并加以改正( )On Christmas Day ,they were in their grandparent's house.—— ————— —— ——————A.B.C.D.
D
改正为grandparents',因为自父母是两个人,两个人每个都是grandparent,所已经改为复数.复数所有格应该在s后面加'

grandparent's 改成grandparents'