Whileoverallratesofsuddeninfantdeathsyndromes(綜合徵)have...
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問題詳情:
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
標籤:
綜合徵
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