2. 专升本
  3. Many difficulties have______ as a result of the exchange over to a new type of fuel.

Many difficulties have______ as a result of the exchange over to a new type of fuel.

admin2011-01-10  32
问题 Many difficulties have______ as a result of the exchange over to a new type of fuel.
选项 A、existed
B、raised
C、arisen
D、aroused
答案C
解析 exist：存在；raise：提起、举起、竖起；arise：产生，生成；arouse：唤醒。故只有C符合句意。
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