Advertisements are a convenient source of useful information
Tour local library is a useful source of information
the advantages of a kind of source of information
NCE2 lesson58 中 a useful source of income为什么用a 而不用an?
he has pointed out that the tree is a useful source of incom
he has ponted out that tree is a useful source of income
he said that the tree is a useful source of income.请问为什么是is
Which of the following is/are from a source?
This is such a useful information that all of us believe it'
There _ (be)a lot of useful _ (information)on the website.
帮忙翻译一句话A lot of useful information is saved in this computer
He bought me a book __(包含)lot of useful information
I obtain a lot of useful information form this book,which wr