问题补充:
Paul always goes to the center of the city .
A. on bike
B. take a bus
C. on feet
D. by car
答案:
A. on bike
B. take a bus
C. on feet
(答案→)D. by car
解析:句意:葆罗总是坐车去市中心。“乘坐交通工具去做某事”即“do sth by bike/car/bus/boat/on foot”,注意需要交通工具使用单数形式,所以on feet表达错误,take a bus在句中做谓语;故选D。