单选题 Cars moved very slowly in the 1920s, but they ______ move more quickly than in 1910.
A.were to can B.did C.will D.can

【正确答案】 B
【答案解析】[解析] 本题考查的是助动词do表示强调的用法。第二个句子的时间状语是过去,并有动词move,且根据前半句判断不能用被动态,因此选择表示强调的did。故选B。