With the guide leading the way we were able to travel ________ the forest not ________ air but ________ foot．A.through; by; onB.across; by; onC.past; on; byD.into; on; by
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A解析本题考查介词的用法，through表示“从……里(中)穿过”；by可表采用某种交通方式，如by land(走陆地)by sea/water(走水路)by train/plane/ship乘火车/飞机/轮船等。但是，表“步行”则说成on foot。