两串钥匙是two set of keys还是two sets of keys,哪个对?为什么?

两串钥匙是two set of keys还是two sets of keys 两串钥匙是two set of keys还是two sets of keys,哪个对?为什么? I lost two ____(set)of keys 我的那串钥匙是旧的.My set of keys 后的be 动词时用is 还是are. a set of keys ,a set of ...意为“一串···”,那么两串钥匙怎么表示______________________.Is this his brother 变为复数形式 _____________________________I am a boy 变为复数形式 ________________________________That is an oran I have two __ .A.set of keys B.set of key C.sets of keys D.sets of They are a set of keys ,It's a set of keys 哪个是正确的? Frank,look at that ____是填 a set of keys还是填set of keys 所有的钥匙用英文怎么说,是all the keys 还是all of the keys? 是Some set of keys.还是Some sets of keys.(⊙o⊙)? 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. 我丢了一串我的钥匙,用英语怎么说?I lost my a set of keys,这样说对不对？ 是a set of keys还是a set of key?哪个正确? I found a set of（ ）选择 A.key B.keys C.tI found a set of（ ）选择A.key B.keys C.two keys D.a key a set of keys英汉互译 You use this set of keys for