69. With the guide leading the way the visitors were able to travel through the forest no

问题补充：

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：

A. by

(答案→)B. on

C. in

D. with

解析：可联系答.案.网客服索取。