Frank,look at that ____是填 a set of keys还是填set of keys
问题描述：
Frank,look at that ____是填 a set of keys还是填set of keys
答
Frank,look at that ____
选择ste of keys
理由：
名词前有指示代词,物主代词,不定代词或名词所有格修饰,不用冠词.
I like this picture better.Is that your book
Take their chairs away!I do not have any money on me.
As time went on,Einstein's theory proved to be correct.
这道题里有指示代词that,不可以说that a set of keys..call••••at •••什么意思