问题补充:
--- How long have you worked here?
--- .
A. Five years ago
B. For five years ago
C. Since five years
D. Since five years ago
答案:
A. Five years ago
B. For five years ago
C. Since five years
(答案→)D. Since five years ago
解析:how long 应该和延续性动词连用,回答时用for +一段时间,或since+一段时间ago或since 一般过去时,故选D