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Whileoverallratesofsuddeninfantdeathsyndromes(綜合徵)have...

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問題詳情：

Whileoverallratesofsuddeninfantdeathsyndromes(綜合徵)have...

While overall rates of sudden infant death syndromes(綜合徵) have decreased in recent years, deaths from sleep suffocation(窒息) ________ over the same time period.

A. double B. have been doubling C. have doubled D. doubled

【回答】

C

知識點：動詞時態與語態

題型：選擇題

Tags：綜合徵

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