【答案】--- Where is David, do you know?

--- Where is David, do you know?

--- I saw him_______with our teacher when l passed the playground just now.

A. talked B. talk C. talking D. to talk

【答案】

C

【解析】

句意：——大卫在哪里你知道吗？——刚才当我经过操场时，我看见他正在和我们的老师谈话。see sb do sth看见某人做过某事，see sb doing sth看见某人正在做某事；根据句意故选C