Tim is on duty today.Look!He _____ [clean]the blackboard.
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Timisondutytoday.Look!He_____[clean]theblackboard.Timisondutytoday.Look!He_____[clean]thebla
Tim is on duty today.Look!He _____ [clean]the blackboard.
Tim is on duty today.Look!He _____ [clean]the blackboard.
Tim is on duty today.Look!He _____ [clean]the blackboard.
is cleaning.look后面必须是进行时态
is cleaning
有look在前，说明是正在进行时，用动词的ing形式。
is on duty today
Tim is on duty today.Look!He _____ [clean]the blackboard.
who is on duty today
what is on duty today?
Who is on duty today?为什么用on duty
Who is on duty today ?是什么意思 谢谢
whose turn is it ( ) on duty today
on duty today
who is ( ) duty today?
whose turn is it-------（be） on duty today
Today is my on duty for the day.
____is on duty today?Li Lei is.怎么填?
on duty today 什么意思?
whose on duty today改错
( )on duty today?Wng Tao( )
Who is ___ duty today?
is Han Meimei-----duty today?
who is on duty