While tow men——at the door,tow others went into the house.快,马上要,3Q

分类: 作业答案 • 2021-12-30 12:41:47

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

应该选B吧
因为前面有while,一般用进行时