As a recent study shows,once the H1N1 flu patients__________to hospital,the elderly have a higher risk of dying.

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问题 As a recent study shows,once the H1N1 flu patients__________to hospital,the elderly  have a higher risk of dying.

选项 A、were sending
B、will send
C、are sent
D、have sent

答案C

解析 考查时态和语态。结合语意“一项最近的研究表明,一旦甲型HINl流感病人住院,老年人的死亡风险更大”,在这个once引导的状语从句中应用一般现在时。主语是动作的承受者,应该用被动语态。因此答案是C。
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