问题描述：
The policeman came up to the lonely house,whose door was open,____there for a while
he policeman came up to the lonely house,whose door was open,____there for a while ,and then entered it
A to stand
B stand
C stood
D standing
he policeman came up to the lonely house,whose door was open,____there for a while ,and then entered it
A to stand
B stand
C stood
D standing
问题解答：
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