His heart was in poor condition, so the doctor ________ him to travel by air．A.hopedB.demandedC.requestedD.forbade
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D解析考查动词辨析。hope不用在hope sb．to do sth．结构中；demand用demand of sb．to do sth．结构，表示“要求某人做某事”；request sb．to do sth．要求某人做某事；forbid sb．to do sth．禁止某人做某事。句意为：他的心脏状况很不好，因此，医生禁止他乘飞机旅行。故选D。