题干
She gave me the suggestion that I try to ________ some money every month for special use.
A：set back
B：set off
C：set dow
D：set aside
答案(点此获取答案解析）
D
A：set back
B：set off
C：set dow
D：set aside
的定义域为实数集，
（e为自然对数的底），则必有（ ）