Cars moved very slowly in the 1930s,but they A faster than in the 1920s.

Cars moved very slowly in the 1930s,but they A faster than in the 1920s.

题目
Cars moved very slowly in the 1930s,but they A faster than in the 1920s.
A.did move B.had moved
C.would move D.were moving帮忙解决
答案
A.did可省把move加d,但这里加个did是强调的意思
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