___ is troubling me is _ I don't understand ___ he s

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_____ is troubling me is _____ I don't understand _____ he said
A;What; that; what;
B. What; what; what
C. That; that; what
D. Why; that; which
帮忙讲解下这道题目?

选A 这个句子是两个从句构成的复合句,
前面一个是由 what 引导的主语从句:What is troubling me is.
后面是由 what 引导的宾语从句 :I don't understand what he said.
中间由 that 连接.
翻译:困扰我的是我不懂他说了什么.

I don’t think the boy can understand it.He is _____ young.A. I don‘t think he is tall,_____?He doesn't think he is tall,_ I don't think he is cool,_____?A do l B don't C is he D isn' I don't know who he is.I _____(forget) his name. I can't understand _____. He's ____a child,don't _____ _____ ___him. -excuse me,_____ is the way to the station?-sorry,i don't kn He is in.同义句 He is _____ _____.He isn't in.He is _____. I don't think he is watching the football match,_____?改反义疑问句 I don't care whether he is _____ the plan or not . I don't want to ____ a _____ ______ my brother because he is Is Mr.Wu from Beijing I don't know _____ A,which city he com