今天老师跟我们说a set of keys后面用is,后来我们读了一篇短文是这样的：Found:A set of keys.Are these yours?那为什么这里用Are these呢?

今天老师跟我们说a set of keys后面用is,后来我们读了一篇短文是这样的：Found:A set of keys.Are these yours?那为什么这里用Are these呢? a set of ____(key). 还有I have a set of (key). 改错 I have a set of key. There is ( ) A.key B.a set of key C a set of keys D.keys 选哪个?为什么 Do you found your a set of key? 是a set of keys还是a set of key?哪个正确? 那么a set of key 中“key一定要加s吗 Is that a set of key,key要不要加s? I have two __ .A.set of keys B.set of key C.sets of keys D.sets of 我的一串钥匙丢了?英语怎么写?My a set of key is lost.My a set of key lost. Sam found a set of -----(key)in front of his house 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 here ( ) a set of key .here后面应该是用are还是 is?顺便 理由 适当填空 There is a set of---------(key) on the table a set of keys 为什么key加‘s’还有play computer games 也加‘s' 今天 我们外教跟我们说了一句话 Doing a favor 英语翻译A new set of nsems semaphores is createdif key has the value IPC_PRIVATE or if no existing semaphore set isassociated with key and IPC_CREAT is specified in semflg.