Linda has been drawing .A. since 10 yearsB. for 10 years agoC. since 2002D. in 2002

问题补充：

Linda has been drawing .

A. since 10 years

B. for 10 years ago

C. since 2002

D. in 2002

答案：

A. since 10 years

B. for 10 years ago

(答案→)C. since 2002

D. in 2002

解析：现在完成时的时间状语经常由since或for来引导，since引导点时间，for引导短时间。都表示段时间。