中文谷Whileoverallratesofsuddeninfantdeathsyndromes(综合征)have...
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问题详情：
While overall rates of sudden infant death syndromes(综合征) 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
知识点：动词时态与语态
题型：选择题
标签：
综合征
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