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问题: 为什么选did而不选can?

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
为什么选B?

解答:

在这里"do(或 did) + 动词原型" 是强调谓语动词的用法,分析这句话是过去时态,故选择"did"