— Has Tom finished writing his essay today? — I have no idea. He it this morning. A. wrot

问题补充：

— 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

答案：

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。