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题型：单选题题类：常考题难易度：普通

You have worked for a long time. You ____________ be very tired.

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

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【解析】

组卷次数：31次 +选题

举一反三

—Could I keep this book for another week?
—Of course you .

— I don't care what my teachers think.

— Well, you_______.

— ______I swim here?

—I'm sorry. Children swim alone here.

—Listen! Is Lily singing in the classroom?

—No. It be lily. She has gone to Paris.

— I hand in the report today?

— No, you needn't.

— Look, it ____________ be our new headmaster.

— It ____________ be him. He went to Shanghai yesterday.

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