问题描述：
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.
( )On Christmas Day ,they were in their grandparent's house.
—— ————— —— ——————
A.B.C.D.
问题解答：
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