They are a set of keys ,It's a set of keys 哪个是正确的?

A set of keys 是there is a set of keys还是there are a set of keys? 是where is a set of keys 还是where are 回答是It‘s 还是They're a set of keys please. 求解(a set of keys) 是a set of keys还是a set of key? a set of keys的英文是什么 ①a set of keys的中文意思是? Those are a set of keys改为一般疑问句 a set of keys英汉互译 Here _(be) a set of keys. a set of keys is on