Is that a set of key,key要不要加s?

Is that a set of key,key要不要加s? 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 还有I have a set of (key). 改错 I have a set of key. 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. 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 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. I have two __ .A.set of keys B.set of key C.sets of keys D.sets of 改错题 1.I want to buy two bottle of milk for m改错题1.I want to buy two bottle of milk for my sun.2.Aren't you student?No,I am.3.It takes Smiths a hour to go to Beijing by a plane.4.This pair of shoese are red.5.That set of key is mine. Sam found a set of -----(key)in front of his house 下面各题均有一处错误,请找出并改正.1.It is English book.__________2.This is s set of key.__________3.Please call Mary in 495-2353._____________4.How are you spell that?____________5.Wang Hong is a girl.His computer game is nice._______ It is reported that panic on the stock market _____a ware of selling.A set about B set up C set off Dset out 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