The policeman came up to the house whose door was open there for a while and went in.A

问题补充：

The policeman came up to the house, whose door was open, there for a while, and went in.

A. to stand

B. standing

C. stood

D. stand

答案：

A. to stand

B. standing

(答案→)C. stood

D. stand

解析：根据“and went in”可知是发生在过去的事情，故用一般过去时。