—— Excuse me is this Mr. Brown’s office? —— I’m sorry but Mr. Brown＿＿＿works here.He left

问题补充：

—— Excuse me, is this Mr. Brown’s office?

—— I’m sorry, but Mr. Brown＿＿＿works here.He left about three weeks ago.

A. not now

B. no more

C. not still

D. no longer

答案：

A. not now

B. no more

C. not still

(答案→)D. no longer

解析：no longer强调时间；no more强调数量和次数。