---Has Tom finished his homework?---I don’t know. But he it the whole morning. A. didB. d

问题补充：

---Has Tom finished his homework?

---I don’t know. But he it the whole morning.

A. did

B. does

Cwas doing

Dis doing

答案：

A. did

B. does

(答案→)C. was doing

D. is doing

解析：此题重点考查过去进行时的基本用法。