Question

Taiwan is part of China . It is ____ the southeast of our country . A. to B. on C. in D. at

请详解为什么选C，选A不行吗？

Answer 1

on the southeast of+地点 指相邻并且接壤
to the southeast of+地点 指相邻不接壤，如中国和日本
in the southeast of+地点 指在……领域之内的东南部
from the southeast of+地点 指从……领域之内的东南部

Answer 2

A是在外面的Southeast，C为在内部