Question

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

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

1. A.
   would help
2. B.
   had helped
3. C.
   was helping
4. D.
   have been helping

Answer 1

C
考查时态。过去进行时表示过去一直在进行的动作。