There is ()"u"and()"s"in the word "useful".

问题描述:

There is ()"u"and()"s"in the word "useful".

a an

a,an。根据u和s的发言来判断,u的发言不是元音,s发音是元音

There is (a)"u"and(an)"s"in the word "useful".
a 和 an是根据发音判断的.u的发音不是元音开头,s是.

There is (a)"u"and(an)"s"in the word "useful".