题目内容
–Look! Our headmaster is standing at the school gate.
–It _______ be our headmaster. He is taking a student to the hospital now.
A. can B. can’t C. must D. mustn’t
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题目内容
–Look! Our headmaster is standing at the school gate.
–It _______ be our headmaster. He is taking a student to the hospital now.
A. can B. can’t C. must D. mustn’t