—Jim have you finished reading Harry Potter and Half-Blood Prince?—No.I my father on the

问题补充：

—Jim,have you finished reading Harry Potter and Half-Blood Prince?

—No.I my father on the farm all day yesterday.

A. would help

B. had helped

C. was helping

D. have been helping

答案：

A. would help

B. had helped

(答案→)C. was helping

D. have been helping

解析：考查时态。过去进行时表示过去一直在进行的动作。