The world"s population problem will be serious _____ all the countries do someth - 初中英语试题 - 超级试练试题库

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The world"s population problem will be serious _____ all the countries do something to control it.[ ]
A. or
B. but
C. unless
D. and

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试题【The world"s population problem will be serious _____ all the countries do someth】；主要考察你对从属连词等知识点的理解。[详细]

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A. When
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A. without; because
B. with; so that
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