是a set of keys还是a set of key?哪个正确?

Frank,look at that ____是填 a set of keys还是填set of keys A set of keys是单数还是复数? 是there is a set of keys还是there are a set of keys?is or are 英语短语开头要不要大写,要不要标点 如 是 a set of keys 还是 A set of keys. 是a set of keys还是a set of key?哪个正确? They are a set of keys ,It's a set of keys 哪个是正确的? 是where is a set of keys 还是where are 回答是It‘s 还是They're是Is this a set of keys 还是 Are they a set of keys a set of keys 后用单数还是复数谓语 a set of keys作主语是谓语动词使用单数还是复数 I lost a set of keys.然后是用 Is this yours?还是Are these yours? a set of keys英汉互译 a set of keys的英文是什么 A set of keys is here划线提问A set of keys划线提问 Here _(be) a set of keys.如题.Here _(be) a set of keys.、 I have a set of keys 根据a set of keys 提问? i lost a set of keys ,i can't find them 还是it. A set of keys < > on the desk..请问 空里填 are 还是is ?谢谢! a set of keys 作主语时谓语用单数还是复数?