问题补充：
单选题
when the newspaper boy got to a blue door, _________, which frightened him away as fast as possible.A.out a fierce dog rushedB.out did a fierce dog rushC.out rushed a fierce dogD.rushed out a fierce dog
网友答案：
热心网友 1楼
C解析考查倒装句。副词out放在句首时，且主语为名词，应使用完全倒装，故选C out rushed a fierce dog，一条凶猛的狗跑出来。
