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题型：单选题题类：常考题难易度：普通

You ________ play with the knife. You ________hurt yourself.

A、mustn't; may B、mustn't; must C、shouldn't; must D、can't; should

举一反三

—Who is the girl stanging over there?
—Well,if you_______ know,her name is Kate.

You ______ stop when the traffic light is red.

—Must I practice the violin right now?

—No, you _____. You ______ do it later on.

We ________ pay to get into the concert, because it's free.

We should ______ as much water as we can because it is good for our health.

— _____ I go out and play football after lunch?

—No, you____.

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