many diffigulties have ( ) as a result of the change over to a new type of fuelA.risenB.arisenC.raised选哪个 为什么?

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many diffigulties have ( ) as a result of the change over to a new type of fuelA.risenB.arisenC.raised选哪个 为什么?

many diffigulties have ( ) as a result of the change over to a new type of fuelA.risenB.arisenC.raised选哪个 为什么?
many diffigulties have ( ) as a result of the change over to a new type of fuel
A.risen
B.arisen
C.raised
选哪个
为什么?

many diffigulties have ( ) as a result of the change over to a new type of fuelA.risenB.arisenC.raised选哪个 为什么?
B.许多问题出现

A.risen 出现,发生,(不及物动词)