While tow men——at the door,tow others went into the house.快,马上要,3QA kept guard B were keeping guardC were kept guardD have kept guard

分类: 作业答案 • 2021-12-20 02:22:43

问题描述：

While tow men——at the door,tow others went into the house.快,马上要,3Q
A kept guard
B were keeping guard
C were kept guard
D have kept guard

答

B while后面加进行时

答

B 正在外面放哨

答

应该选B吧
因为前面有while,一般用进行时