I had a busy and tiring weekend because the house for the Christmas cost me a whole day．
A. decorating
B. to decorate
C. decorated
D. decorate
网友回答
(答案→)A. decorating
B. to decorate
C. decorated
D. decorate
解析：句意：因为要迎接圣诞节，装饰房子花费了我一天的时间，因此我过了一个繁忙和劳累的周末。“装饰”和其逻辑主语“我”之间是主动关系，故用现在分词作原因状语，选A。