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。
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