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题型：单选题题类：真题难易度：普通

上海市2018年中考英语试卷（含小段音频）

Mr Black walked around and offered help ____ we were doing an experiment.

A、while B、although C、until D、unless

举一反三

Some people won't realize the importance of their health they have lost it.

Some people don't know the importance of their health ________ they have lost it.

they were tired, none of them wanted to have a rest.

Daily homework is necessary, _________too much of it may bring harm to students.

—The air pollution is terrible.

—It will be worse ______ we take action to protect the environment.

_________ we didn't win the basketball game, we were satisfied with our hard work.

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