It still puzzles today’s scientists ______ some mammals produce their young ____ - 高中英语试题 - 超级试练试题库

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题型：不详难度：来源：

It still puzzles today’s scientists ______ some mammals produce their young ______ others lay eggs to produce their offspring( 后代)

A．that; while

B．why; while

C．how; when

D．what; as

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试题【It still puzzles today’s scientists ______ some mammals produce their young ____】；主要考察你对连词等知识点的理解。[详细]

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