here is a set of keys.改为否定句

here ( ) a set of key .here后面应该是用are还是 is?顺便 理由 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 Is that a set of key,key要不要加s? Here is a set of___(key)怎么做?横线上填空! 还有I have a set of (key). 改错 I have a set of key. here is a set of keys.改为否定句 A set of keys is here划线提问A set of keys划线提问 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. 适当填空 There is a set of---------(key) on the table 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 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. Here _(be) a set of keys.如题.Here _(be) a set of keys.、 I have two __ .A.set of keys B.set of key C.sets of keys D.sets of Here is （）?Are these yours.A.a set ofHere is （）?Are these yours.A.a set of keys B.a set of keysC.the keys D.keys填什么 ,为什么