题干
—Excuse me ? Do you know _________?
—He may live No.l6, Horse Bridge Road, Ken Town.
A：where does Mr. Smith work
B：where Mr. Smith lives
C：how Mr. Smith comes back
D：when Mr. Smith goes home
答案(点此获取答案解析）
B
cause he used to live in the apartment.
，
，
分别为等差数列的第1、4、6项，则这个等差数列前n项和的最大值为
