问题
单项选择题
The sun heats the earth,（）is very important to living things.
A.that
B.what
C.which
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
The sun heats the earth,（）is very important to living things.
A.that
B.what
C.which
参考答案：C