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It is imperative that Hurstwood ______ to hospital at once.
A、is taken
B、shall be taken
C、should be taken
D、must be taken
【正确答案】：D
【题目解析】：D at once 立刻，马上；情态动词must 表达一种坚定的建议，表明Hurstwood 情况很严峻，必须马上送医院；又Hurstwood是被送往医院，所以用被动语态。