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题型：单选题题类：常考题难易度：普通

—The window must have taken you quite a lot of time that day.
— You are right. They ________ for weeks.

A、haven't been cleaned B、hadn't been cleaned C、didn't cleaned D、haven't cleaned

举一反三

The old man toothache sighed in great relief.

Ann ________ a certificate at the end of the program to show she has learned computer skills.

We {#blank#}1{#/blank#}(intend) to arrive at our destination at 9 o'clock, but we didn't because of the traffic jam.

It was the first time in my life that I ______ the wonderful scene.

If you want to ask questions in the class, you{#blank#}1{#/blank#} (expect) put up your hand.

If the rule is {#blank#}1{#/blank#} (废除), more girls will have the opportunity to go to school.

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