题干
---You see, I’m poor in Chinese, you are not good at English, and...
--- That’s ____ we should help each other.
A：whe
B：where
C：how
D：what
答案(点此获取答案解析）
B
A：whe
B：where
C：how
D：what
中，自变量
的取值范围是 ▲ ．