can,may,need,must的肯定句,疑问句及其回答,特殊疑问句的结构。各举一...答:Yes ,you must.No, you needn't./ No, you don't have to .Need I do sth?Yes , you must.No, you needn't.也可以看看这个 —Must I do it at once?—No,you ___.A.mustn't B.needn't C.can't D.don't 此题应选B。一般说来,以must引出的一般疑问句,其否定回答通...