— Look! The light in Mr. Brown's office is still on. He ___________ be working there.— It ___________ be him. He has go

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1. — Look! The light in Mr. Brown's office is still on. He ___________ be working there.
— It ___________ be him. He has gone to America.

A . must; mustn't B . can; mustn't C . must; can't D . can; can't

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人教新目标（Go for it）九年级英语上学期期末试题