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题型：单选题题类：模拟题难易度：普通

You be hungry after the long walk. Help yourself to some cakes.

A、should B、 must C、need to D、ought to

举一反三

These shoes aren't comfortable. You __________ wear them.

— There's somebody at the door. Who ____ it be? Is it the postman?
—No. It ______ be him. It's just seven o'clock. It's too early.

Look at the sign! It says “No Smoking!” You ________ smoke here. It's dangerous.

— There is somebody under the tree. Is it Mr. Lee?

— It ________ be Mr. Lee. He left for Beijing this morning.

The lady in red ______ be over fifty! She looks so young.

When you have classes, you ________ listen to the teacher carefully.

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