jim is father is（ )night duty today

Nobody is ( )duty today. who is ( ) duty today? is on duty today is Han Meimei-----duty today? what is on duty today? Who is ___ duty today? who is on duty today Is your father ()()today? Who is on duty today?为什么用on duty Is she _____ duty today?填介词, Who is on duty today ?是什么意思 谢谢 whose turn is it ( ) on duty today