问题
选择题
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
答案
答案：B
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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.
A．by
B．on
C．in
D．with
答案：B