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题型：语法填空（单句）题类：常考题难易度：普通

人教版（新课程标准）高中英语必修3 Unit 1同步练习一

It is thought to be a plant of Africa, but no one knows exactly the origin of this plant, because we don't have any material about it. (origin)

举一反三

V{#blank#}1{#/blank#}actions or activities are done because someone chooses to do them and not because they have been forced to do them

The library has an a{#blank#}1{#/blank#} supply of books, so don't worry about not finding what you need.

He showed {#blank#}1{#/blank#}(remark) competence when he faced the difficult problems.

The issues being discussed here are very common, so they're not u{#blank#}1{#/blank#} to the US.

I will observe the law {#blank#}1{#/blank#}(faithful) and fulfil my duty as a Chinese citizen.

Nearly 5％ of working men are already {#blank#}1{#/blank#}(employ); In other words, they are out of work.

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