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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

標籤:綜合徵