The cars in the 1920s were much slower than those of today, but they run faster
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The cars in the 1920s were much slower than those of today, but they ________ run faster than a bike．
A.would
B.did
C.had
D.have
试题答案
B
本题考查助动词do用于加强语气的用法。do用于祈使句和陈述句中加强谓语动词的语气。如：He does work hard．I did go to the cinema．Do be careful．本句的句意是：20年代的车是比现在的车慢多了，但比起自行车来的确是快多了。所以答案为B项。