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题型：单选题题类：常考题难易度：普通

四川省师范大学附属中学2017-2018学年九年级上学期英语Unit 7 Section B同步习题

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

A、must be done B、must do C、may be done

举一反三

—How dirty the room is?

—Yes, it ________ every day.

Teenagers should {#blank#}1{#/blank#}(allow) to choose their own clothes.

— Must old people ________ to politely?

— Yes, you ________.

Thanks to the Internet, different kinds of information can {#blank#}1{#/blank#} (learn) in a short time.

The water should {#blank#}1{#/blank#} (not put) here.

Waste water from factories must ____ before pouring into rivers or lakes.

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