Do you know what country is north of U.S.

题目

Do you know what country is north of U.S.
改错A.DoB.what C.is哪一个错了并改正

答案

选B.把what改为which.
此处应为which引导的定于从句,用于修饰country,指“哪一个”,而非what引导的状语从句.