题目
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
A kept guard
B were keeping guard
C were kept guard
D have kept guard
提问时间：2020-10-15
答案
应该选B吧
因为前面有while,一般用进行时
因为前面有while,一般用进行时
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