When I came here just now I saw he with a black and white dog in the garden.A. playB. to

问题补充：

When I came here just now, I saw he with a black and white dog in the garden.

A. play

B. to play

C. was playing

D. playing

答案：

A. play

B. to play

(答案→)C. was playing

D. playing

解析：句意：刚才当我进来的时候，我看到他正和一只黑白相间的狗在花园里玩。He是主格形式，所以saw后面跟的是一个进行时态的完整的句子。故选C。