—Have you watered the plants yet Kathy? —Yes. I that this morning.A. will do B. did C

问题补充：

—Have you watered the plants yet, Kathy? —Yes. I that this morning.

A. will do

B. did

C. have done

D. was doing

答案：

A. will do

(答案→)B. did

C. have done

D. was doing

解析：句意：--- Kathy，你浇灌植物了吗？--- 是的。我今天早上浇的。由句意可知this morning是过去的时间状语，所以要用一般过去时，A. will do是一般将来时；C. have done是现在完成时；D. was doing过去进行时。故选B。

考点: 考查动词时态的用法。