Tim is on duty today.Look!He _____ [clean]the blackboard.

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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.


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