问题
选择题
Many difficulties have as a result of the change over to a new type of fuel.
A．risen
B．raised
C．arisen
D．arrived
答案
答案：C
risen上升，不及物动词，raised举起，升起，及物动词，arisen产生，出现，arrived到达，句意：由于一种新燃料改变的结果，许多困难出现了。故选C。
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