“Where is Mother.” “She is in the kitchen. She the housework all morning.”A. is doingB. w

问题补充：

“Where is Mother.” “She is in the kitchen. She the housework all morning.”

A. is doing

B. was doing

C. has done

D. has been doing

答案：

A. is doing

B. was doing

C. has done

(答案→)D. has been doing

解析：现在完成进行时表示从过去至今一直在持续的动作。