Question

That old man has been living here ________.

A. for ten years before
B. since ten years ago
C. since ten years
D. ten years ago

Answer 1

答案B
答案选“B”。表示时间概念时“for”和“since”均可用作介词，与现在完成时连用。“for”后的时间通常是时间段；“since”后的时间常为时间点。本题时间状语有两种表达法： for ten years和since ten years ago。