— Has Tom finished writing his essay today?
— I have no idea. He it this morning.
A. wrote
B. has written
C. was writing
D. had written
网友回答
A. wrote
B. has written
(答案→)C. was writing
D. had written
解析：考查时态，句意：汤姆今天写完他的论文了吗？——我不知道。他这个上午一直在写。可知下文描述的是过去正在进行的动作，故选C。