may i go home now,Mr li ?sorry, you ___clean the classroom firsta:must b:may

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may i go home now,Mr li ?sorry, you ___clean the classroom firsta:must b:may
may i go home now,Mr li ?sorry, you ___clean the classroom first
a:must b:may

may i go home now,Mr li ?sorry, you ___clean the classroom firsta:must b:may
A
原因:must的意思是必须
you must clean the classroom first.你必须先把教室打扫干净

【A】必须