We keep in touch with them by ______ telephone.

admin2009-04-15  55

问题 We keep in touch with them by ______ telephone.

选项 A、the
B、×
C、a
D、an

答案B

解析 介词by后接运输工具类名词(bike,bus,plane等)或通讯工具类名词(phone,tele graph等)表示手段、方法,通常不用冠词。
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