— Peter isn't in the classroom. Where is he? — I'm not sure. He ___________________ be in the library.

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1. (2021·北部湾模拟) — Peter isn't in the classroom. Where is he?
— I'm not sure. He ___________________ be in the library.

A . must B . might C . mustn't D . needn't

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广西北部湾经济区2021年中考英语全真模拟（四）试卷