说明原因 Who do you think has made my room so dirty,mom?It __be your younger brother.A.must B.shallC.willD.would

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说明原因 Who do you think has made my room so dirty,mom?It __be your younger brother.
A.must
B.shall
C.will
D.would

A must be 表示肯定推测
妈妈 你知道谁把我的房间弄真么脏么 肯定是你小弟弟
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