单项选择：—Is Jack on duty today?—It ( )be him;it is turn tomorro

whose turn is it-------（be） on duty today whose turn is it ( ) on duty today whose turn is it ________(be)on duty today?以及填空的原因 连词成句 turn it to is duty on my today be it is your turn to be on duty.（ ） it is your turn to be on duty ,为什么用so it is,而不用so i am It's your turn to be on duty（） A、so it is B、so am I is on duty today 一个英语单项选择题.单项选择Is his name Jack?A、 Yes,it is.B、 No it is not. It’s your turn to be on duty._______ l'm at school and it's my turn to be on duty today的意思是什么 单项选择.Jack is playing chess .He is good at ____ A.it B.them C