问题补充:
--- I called you yesterday but you weren’t at home.
--- I flowers in my garden at that time.
A. water
B. am watering
C. watered
D. was watering
答案:
A. water
B. am watering
C. watered
(答案→)D. was watering
解析:句意:我昨天给你打电话了,但是你不在家。——那时我正在花园里面浇花。结合语境可知下文描述的是过去正在进行的动作,故用过去进行时态,选D。