My father has worked there .A. since five yearB. since 1990 C. for five years agoD. five y

问题补充：

My father has worked there .

A. since five year

B. since 1990

C. for five years ago

D. five years

答案：

A. since five year

(答案→)B. since 1990

C. for five years ago

D. five years

解析：现在完成时的时间状语，since+时间点；for+时间段。Since 1990自1990年以来表示时间段故选B。