—Can you tell me if Tom has finished his homework?
—I've no idea. He it this morning.
A. has being doing
B. had done
C. is doing
D. was doing
网友回答
A. has being doing
B. had done
C. is doing
(答案→)D. was doing
解析：答案：D 考查动词时态。句意为：——你能告诉我Tom是否完成家庭作业了？——我不知道。今天早上他正在做。根据答语可知，做作业的动作发生在过去，强调的是当时的动作正在进行，因此用过去进行时。故D项正确。