David goes to school_______(bike)every day

问题描述:

David goes to school_______(bike)every day
A.by a bike B.by his bike

by bike
交通工具的介词一般都是by
A和B都没错,但是二者选优A,因为没有上下文,不需要特指是他的自行车,所以用不定冠词a就行.