2. 专升本
  3. Many difficulties have______as a result of the change over to a new type of fuel.

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

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问题 Many difficulties have______as a result of the change over to a new type of fuel.
选项 A、risen
B、arisen
C、raised
D、arrived
答案B
解析
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