Question

-Has Tommy fixed his second-hand car yet?

-I have no idea, but he ________ it this morning．

1. A.
   was doing
2. B.
   is doing
3. C.
   has done
4. D.
   did

Answer 1

A
考查动词时态。根据时间状语this morning可知时间是过去，且根据句子意思可知所填部分表示过去某一时间正在进行的动作，用过去进行时，选A。难度适中。