"How do you do"is a very ___ question which you don't have to answer.[A} usual [B] unusualAnd please tell me the reason after answering me.I think I should choose A,but the answer is B and I don't know why.

How do you do? How Do You Do? how do you do? how do you do How do you do how do you do How do you do how is your mother?答：---------------------------- how do you do 答：--------------------- How much of a barrier do you think language is? -----?-It's beautiful.A.What do you likeB.What is it likeC.How is it likeD.How do you think How do you think“time is money” ---Li hao,this is my friend Tom.---________________.A How are you . B How do you do How do you you If I give you a chooce,how do you do?. BeFour - How Do You Do How do you do that? you that how do do 翻译how do you do?