A:坐着比躺着时F1大
B:躺着比坐着时F1大
C:坐着比躺着时F2大
D:躺着比坐着时F2大
将所给句子中的一处错误找出并改正在横线上。
I was happy that my father promised buying a new computer for me.
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我国章回体小说的开山之作是( )