I am ___ duty today中间应该填什么?如何翻译duty today ,以及整句话的意思?

I am ___ duty today中间应该填什么?如何翻译duty today ,以及整句话的意思? Who's at duty today?I am哪里错了 找错：Who is at duty today?I am. Who is ___ duty today? Who ___(be）on duty today Li Ming and I ___(be). I think Ann must____on duty today A.be B.is C.are D.am为什么? I'm on duty today翻译 为什么-（ ）is on duty today?-I am.A,who B,whose C,which 选什么 为什么 的比赛I think Ann must () on duty today.A.be B.is C.are D.am I am on duty this morning. today,i am very She'll be on the same train ___ I am on today.A.as B.that Today,I am very sad! I am tired ( ) happy today. on duty today is on duty today who is ( ) duty today? Today is Thursday.March the 12th.Good afternoon boys and girls.My name is Wu Chun Ming.and I am a 11- year-old Chinese girlI am glad to know you and I hope we can become friends.Since I am on duty today,I am going to tell a joke.Tommy's mom sent him