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69. With the guide leading the way, the visitors were able to travel through the forest not by air but _____ foot.

69. With the guide leading the way, the visitors were able to travel through the forest not by air but _____ foot.

A. by                           B. on                           C. in                                   D. with

With the guide leading the way, the visitors were able to travel through the forest _____ foot.

A. by                           B. on                    C. in                            D. with

69. With the guide leading the way, the visitors were able to travel through the forest not by air but _____ foot.