-Who do you think has made my room so di

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问题 -Who do you think has made my room so dirty, Mom?-It____ be your younger brother.(  )A. must B. shall C. will D. would

选项 A. must
B. shall
C. will
D. would

答案 A

解析 考查情态动词。must表示猜测的意思,一定。
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