makes us happy is__ our parents are still healthy an

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____makes us happy is______ our parents are still healthy and strong.
A.It that B what that
我觉得是选B 能不能讲一下为什么?

答案应该是B
如果选A 的话,前半句已经是一个完整的句子了,根本不需要后半截.
It makes us happy.无语法错误,只是不知道具体内容而已.
而what makes us happy 除非后面跟的是“?”否则句子就没完,因为人家不知道这句话要表达什么意思.正因为如此,所以题中有后半句“our parents are still healthy and strong”这就是那“what”是人家想知道的,它做主语.

____makes us happy is______ our parents are still healthy an we are happy to receive our parents' letter (同义句)we are happ we are happy to receive our parentsˊletter.(同义句) Parents are our first teachers.They teache us lessons of lif Parents are always strict with us __ our studies.A,with B,in our parents are kind ( )us.A,in B,at C,for D,to our parents us taken good care of by are连词成句 In this world our parents are the people who love us most So no matter how old we are,most of us feel happy when our pare our parents often tell us not to_______ 英语翻译Dear sir,How are you?Received an Enquiry from our US off D()can help us keep our teeth healthy