We need to learn（）A how to be polite B what to do it C how t

We need to learn（）A how to be polite B what to do it C how t In order not to o—— people,we need to learn how to be polite we need to learn how to be polite when we make requests 求主谓宾 翻译We need to learn how to be polite when we make requests we need to learn how to be polite by _______ (be) less direc He doesn't know__next.A,how to do;B,what to do it;C,where to I really don`t know_____ A.what to do it B.how to do C.what （ ）We don't know ______.A.how to do B.which to do C.what to I don't know ( ).A.what to do it B.how to do it C.what to do we do not know______.a:how to do b:which to do c:what to do How to be polite 7.I don’t know _________.A.what to do it B.how to do it C.wh