问题
选择题
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
答案：C
题目分析：根据“and went in”可知是发生在过去的事情，故用一般过去时。
点评：通过时间状语、句意以及上下文的联系来判断时态。