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题型：单选题题类：模拟题难易度：普通

— Listen! Helen is singing in the classroom.
—It _______ be Helen. She has gone to Shanghai.

A、mustn't B、may not C、can't D、should

举一反三

——Our class won the English speaking contest.
——Congratulations! You________ be very proud of it.

— We have to finish it today.

— What? That's impossible.

The disabled _______ able to do the same things as common people.

He _________ work on the farm every day. I'm sure about that because his skin is very black.

In the future, the robots will cook for us.

—All of us ______ classify(分类) the rubbish so that we can improve the environment.

—I agree. I think it's very important.

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