一Is Mrs Black really badly ill?一shes in hospital．A. I dont think soB. No，she isntC. I

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A. I don't think so
B. No，she isn't
C. I don't hope so
(答案→)D. I'm afraid so
解析：I don't think so我不这样认为；No，she isn't不，她不是；I don't hope so 我不希望这样；I'm afraid so恐怕是这样的。句意：布莱克夫人病得真地很严重吗？根据下文，她住院了。可知选D。