In the cinema there was an old man beside me.A. atB. sitC. sittingD. to sit

问题补充：

In the cinema, there was an old man beside me.

A. at

B. sit

C. sitting

D. to sit

答案：

A. at

B. sit

(答案→)C. sitting

D. to sit

解析：用现在分词做定语。不定式表示将来。