HAVE YOU EVER COME ACROSS THIS?做以下过程：从2—9中任选一个数,在乘以9.再把所得的两位数的个位和十位相加得到得数为9.为何会这样?PLEASE!请您仔细审题PLEASE!

此空中应该选哪个,具体解析：---Have you ____ been to our town before?---No,it's the first time I ___ here.　　A.even,come　 B.even,have come　　C.ever,come　 D.ever,have come Have you ever been to the Summer Palace?—No.It is the first I _____ to China.A come B have come C am coming D came Have you (ever)studied (with)a group? have you ever entered a competition Have you ever e______ a singing competition? have you ever 什么 a tuxedo Have you ever caught in a rush? Have you ever come_______such a difficult problem have you ever been with a have you ever caught a chicken have you ever been a lady-killer? 造句：Have you ever. Have you ever heard Have you ever --Have you closed the door____?--Not_____.A.yet,yetB.ever,yetC.ever,everD.already,ever Do you like animals have you ever kept a pet? have you ever had adream come true其中问什么have后had是过去分词,而had后come也是过去分词?这句话中had和have有什么区别? ever,never,yet 的用法Have you ( ) been to Beijing?No,( ) A ever ever B yet ,never C ever never