we ___ be friendly to our classmates.A.may B.should C.needn't D.mustn'twe _____ follow others .we should do all by ourselves A.don't need B.haven't to C.needn't D.mustn'thow easy it is ____ after a dog A.looking B.look C.to look D.looks选什么?为什么?第2题的D是needn't to
问题描述：
we ___ be friendly to our classmates.A.may B.should C.needn't D.mustn't
we _____ follow others .we should do all by ourselves A.don't need B.haven't to C.needn't D.mustn't
how easy it is ____ after a dog A.looking B.look C.to look D.looks
选什么?为什么?
第2题的D是needn't to
答