At school,we have to (clean the blackboard).对划线部分提问_____ ______ you have to _____ at school.

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At school,we have to (clean the blackboard).对划线部分提问
_____ ______ you have to _____ at school.

(What do) you have to (do) at school?
解释:因为这里要提问的是clean the blackboard,所以要用what来提问.

At school, we have to (clean the blackboard)
(what)(do)you have to (do)at school?