If you want to visit an island you shoulD. .A.take a bus B.take a boat C.by boat D.by pl

问题补充：

If you want to visit an island , you shoulD. .

A.take a bus B.take a boat C.by boat D.by plan

答案：

解析：take a bus乘公交去；take a boat乘船去；by boat乘船；by plane乘飞机。句意：你如果想去一个小岛，你应该乘船去。By boat只能表示交通方式，不能充当谓语。结合语境可知选B。