问题描述：
两道英语题,不明白为什么这样填?!
1.There is __an___"r"and___a___"d" in the word "door"
2.Jack has __a___useful book.__The___book is also very interesting.
不明白! "r"又不是元音字母.为什么用"an"? "useful book"的"u"是原因字母,可是为什么么用"a"?
谁能解开我的疑问啊?谢谢了~
1.There is __an___"r"and___a___"d" in the word "door"
2.Jack has __a___useful book.__The___book is also very interesting.
不明白! "r"又不是元音字母.为什么用"an"? "useful book"的"u"是原因字母,可是为什么么用"a"?
谁能解开我的疑问啊?谢谢了~
问题解答：
我来补答展开全文阅读