I left it here a moment ago.what color is the bag ? we found one really.最后一句为什么要用 one?

It's been a while since I left here 这个here 到底有没有问题啊 Did you see ___ bike?I left it here yesterday.填a还是the? ---------Have you seen ______pen?I left it here this moring.--------Is it_____black one?I think I saw it somewhere.A a,a B the,a ---Have you seen ( )pen I left it here this morning.---Is it ( )black one I think i saw itsomewhere.A:a;the B:the;the C:a;a -have you seen____pen?I left it here just now.-Is it_____yellow one?I think I saw it somewhereAa,the Bthe,the Cthe,a Da,a Dear Mom, It isn't a n__1__ day today. It's raining and I feel sad b__2__ IDear Mom ,It isn't a n___1___ day today . It's raining and I feel sad b___2___ I miss you so much . Now I'm s___3___ in the library . There are m___4___ students here today . Have you seen a ( )pen I left it here this morning.Is it( )black one?I think I saw it somewhere.Is it ( ) black one I think I saw it somewhere.这两个空都填什么?请说明原因. Have you seen____ bag?I left it here just now.Is it ____one on tA.a aB.the theC.a theD.the a Have you seen_____pen?I left it here this morning这里填a,如果改成Have you seen ____ pen which I left here this moning.是不是就填the? I am sorry I LEFT THE BOOK AT HOME I------it here tomorrow It was____ that I found my lost books.A where I had left themB wherever C in the place that I had leftD here and there Have you seen （）book?I left it just around here this morning .Is it （）English oneHave you seen （）book?I left it just around here this morning .Is it （）English one I think i saw it somewhere.A a the B the the C the an D a an i'm sorry i ( ) my homework at home.i'll ( ) it here tomorrow.ok.don't forget it next time.a.forgot;take b.left;take c.forgot;bring d.left;bring请问选哪个啊 英语8.-Have you seen _______ pen?I left it here this morning.8.-Have you seen _______ pen?I left it here this morning.-Is it _______ black one?I think I saw it somewhere.a.a;the b.the;the c.the;a d.a;a为什么 1.--- Have you seen ____ knife?I left it here this morning.--- Is it ____ white one?I think I saw it somewhere.A.a; the B.the; the C.the; a D.a; a我选择的是A, Please___your coat,Ben.Ok,Mom.I feel a little hot here —Have you seen ________ pen?I left it here this morning.—Is it _________ black one?I think I saw it somewhere.A.a,the B.the,the C.the,a D.a,aA为什么不可以? -----Have you seen----pen?I left it here-----Is it---black one?I think I saw it somewhereA the the B the a C a a D a the