Mr Smith likes traveling ，but his wife enjoy . A. by train; taking a taxiB. on train; b

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A. by train; taking a taxi
B. on train; by taxi
C. by train; by taxi
D. on train; taking a taxi
解析：句意：史密斯先生喜欢坐火车旅行，但他妻子喜欢坐出租车。介词by后加某种交通工具，表示交通方式，须注意交通工具前没有冠词，如：by bus/ car/plane/ship。如果用介词on或in，则交通工具前要加定冠词或物主代词,如：on the bus/ in my car等。第二空前有一动词enjoy，而这个动词经常用于enjoy doing sth.喜欢做某事。