Cars moved very slowly in the 1930s,but they faster than in the 1920s.
A. were moving
B. did move
C. had moved
D. would move
网友回答
A. were moving
(答案→)B. did move
C. had moved
D. would move
解析：19世纪30年代的汽车行驶速度非常慢,但是它确实比20年代的车快了很多,did move助动词did提前表示强调,确实……