【题目】In the past, many people. to work by bus. Nowadays they to work by underground. （ ）
A. go, go B. went, go C. go, went D. went, went
【答案】B
【解析】
句意：过去，许多人乘公共汽车……上班。现在他们乘地铁……工作。前句是一般过去时，谓语用动词过去式，后句是一般现在时，主语是复数，谓语用动词原形，A去，动词原形；去，动词原形，B去，过去式；去，动词原形，C去，动词原形；去，过去式，D去，过去式；去，过去式。故选B.