问题补充：
At the sight of the policeman from behind the door.
A. did the boy rushed out
B. rushing out was the boy
C. out rushed the boy
D. the boy was rushing out
答案：
A. did the boy rushed out
B. rushing out was the boy
(答案→)C. out rushed the boy
D. the boy was rushing out
解析：句意：一看到警察这个小男孩从后门就跑了出去。考查：副词放在句首时，使用完全倒装。答案为：C。
