求主语从句的解析和答案4，谢谢~

Question

9. It worried her a bit ______________ her hair was turning gray.
A. whether B. that
C. what D. when
10.What I say and think ___ none of your business.
A. is B. are C. has D have

Answer 1

9.这是主语从句，it是形式主语，而后面的从句her hair was turning gray
是真正的主语，而这个从句是完整的，所以只需要连接词that即可。
10.What I say and think 是主语从句，主语是一句话的话，系动词用单数，none of your business意思是和你无关，整句话的意思：我所说的和想得都和你无关。