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

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

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
答案
应该选B吧
因为前面有while,一般用进行时
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