I called you yesterday but you weren’t at home.I flowers in my garden at that tim

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。