2. 外语
  3. Many problems have______as a result of the change over to a new type of fuel.

Many problems have______as a result of the change over to a new type of fuel.

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问题 Many problems have______as a result of the change over to a new type of fuel.
选项 A、risen
B、arisen
C、raised
D、aroused
答案B
解析 动词词义辨析。根据句意，可排除选项A和C。problems做主语，arouse为及物动词，应用被动语态，选项D排除。arise是不及物动词，没有被动语态。故答案为B。
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