主语从句专项练习 (含答案)1._ makes mistakes must correct them.A. What B. That C. Whoever D. Whatever2. It worried her a bit _ her hair was turning grey.A. while B. that C. if D. for3.When and why he came here _ yet.A. is not known B. are not known C. has not known D. have not known4. _ is no reason for dismissing her.A. Because she was a few minutes late B. Owing to a few minutes lateC. The fact that she was a few minutes late D. Being a few minutes late5
