People traveling long distances frequently have to decide they would prefer to go by land, sea or air.
A. which
B. how
C. why
D. whether
网友回答
A. which
B. how
C. why
(答案→)D. whether
解析：主要测试宾语从句。分析句子结构可知动词decide需要宾语，另外句子 they would prefer to go by land, sea or air中含有or，应该属于选择性句子，结合答案可知用whether。译文：那些经常去远地方旅游的人宁愿选择乘公共汽车、轮船还是飞机呢。