Mary is ___ American.She comes from ___ Unite States of ___ America.an ,the ,/ 请问怎么来解释为什么选择这个答案?我知道第一个选an是因为 American是元音因素 所以用an .那后面呢?

mary an American friend ___ looking forwatd to visiting china at present.A.are B.is C.were D.have been 为什么? 1.This is Mary.This is ___ ___. Mary is as old as Kate.改为同意句 Mary has ___ ___ age ___ Kate. mary is ten,kate is twelve.(合并成一句)mary is___ ___ ___ ___kate怎么填 Mary is ___ American.She comes from ___ Unite States of ___ America.an ,the ,/ 请问怎么来解释为什么选择这个答案?我知道第一个选an是因为 American是元音因素 所以用an .那后面呢? Mary is good at singing.(改为同义句)Mary ___ ___ .改句子,每空格一词 1.Mary comes from (Britain).对括号里提问 ___ ___does Mary come from?2.Miss Brown and Mr Smith are (American).对括号里提问___ ____are Miss Brown and Mr Smith?3.Xiao Ming is good at playing the piano.同义句转 美国玛丽 AMERICAN MARY怎么样 mary is fourteen years old now.可改为___ ____ is Mary now ―Hello ,is ___ Mary speaking?―No,___ is Cind―Hello ,is ___ Mary speaking?―No,___ is Cindy. 英语单项选择：Mary is American,But she can speak _____（China,Chinese） Mary is an American girl but she lives in Zhejiang with her parents.阅读理解 Mary is a teacher.(Mary is a doctor)改为选择疑问句 ___ Mary a teacher___or a doctor Tom is as old as Mary.Tom is___ ___ ___Mary Mary's job is to make sick people ___.( good) This is ___(we) friend,mary横线上填空. mary is too busy to take a holiday.同义转换 mary is not___ ___ ___ ___a holiday 把The name of Mary`s bird is Polly.改为疑问句改为 ___ ___ ___ ___ ___ bird?