题干
—Why you so busy today? —Because I’m getting ready Christmas.
A：do, at
B：are, for
C：do, on
D：are, at
答案(点此获取答案解析）
B
—Why you so busy today? —Because I’m getting ready Christmas.
A：do, at
B：are, for
C：do, on
D：are, at
，恒有 
，则 
