— It _______ be Jack who is in the office.
— No, it _______ be him. I saw him off at the airport half an hour ago.
A．can’t ; can’tB．must; can’t
C．must; mustn’tD．may; mustn’t
B
must表推測(cè)只用于肯定句；在否定句和疑問句中用can。
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