2. 外语
  3. The old man was shocked to learn that his illness could result in death if______ untreated.

The old man was shocked to learn that his illness could result in death if______ untreated.

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问题 The old man was shocked to learn that his illness could result in death if______ untreated.
选项 A、to leave
B、to be left
C、leaving
D、left
答案D
解析 本题干意为“老人很惊讶地得知如果他的病不治疗的话．会导致他的死亡”。动词非谓语形式if，while，when，although，as，unless等连词和关系副词后面可以直接加现在分词和过去分词，分词的选择主要看主句的主语和分词动作之间的关系，如果是主动关系就用现在分词，反之用过去分词。故答案为D)。
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