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题型：单选题题类：模拟题难易度：普通

In America, a friend inviting you to a restaurant doesn't mean that he or she will pay for the meal ______ you are told ahead.

A、until B、unless C、although D、if

举一反三

P. E. is my favorite subject __________ it's interesting.

一Do you usually go to school by bus on foot?

—By bus．

Sally is only four years old. _________ ,she can sing and dance very well.

Zhang Peng didn't go home u{#blank#}1{#/blank#} he finished his homework yesterday.

I have a sister, a brother cousin.

Some dinosaurs were as gentle as sheep _________ others were fiercer than tigers.

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