Before the tourists set off they spent much time setting a limit the expenses of the tr

问题补充：

Before the tourists set off , they spent much time setting a limit the expenses of the trip.

A. in

B. for

C. to

D. about

答案：

A. in

B. for

(答案→)C. to

D. about

解析：考查介词：a limit to“…的限制”，句意是：在游客开始动身前，他们花了很多时间为旅行的开销设置了限制。选C。