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题型：单选题题类：模拟题难易度：普通

—He ____be in the classroom, I think.
—No, he_____ be in the classroom. I saw him go home a minute ago.

A、can, may not B、must, may not C、may, can't D、 may, mustn't

举一反三

Don't put off today's work for tomorrow. I mean, today's work ______ today.

—What time will we arrive there?

—You had better 8 o'clock.

If you want to pass the exam, you{#blank#}1{#/blank#}work harder. （填情态动词）

— Someone is knocking at the door. Is it Ann? I've been waiting for her so long.

—I'm sorry, it _____ be her. I saw her staying at school half an hour ago.

—Is the woman Miss Zhao？

—It ______ be her. She has gone to Qingdao for a meeting.

Many students come from poor families and they ___ afford school lunches, so the government is trying to help them.

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