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。