英语语法题,求解

问题描述:

英语语法题,求解
____that we couldn't catch up with him.
A.So fast he ran B.So fast did he run
C.So fast ran he D.Such fast did he run
为什么呢
为什么A不行必须要did吗?为什么

B...
倒装句.
后面的时态,判断出要用过去时.
he ran so fast 对
he ran such fast 不对.D 不行