46. (单选题) Many difficulties have ( ) as a result of the exchange over to a new type of fuel.(本题1.0分) A、 existed B、 raised C、 arisen D、 met

46. (单选题) Many difficulties have ( ) as a result of the exchange over to a new type of fuel.(本题1.0分)
A、 existed
B、 raised
C、 arisen
D、 met

出自：河南城建学院大学英语四

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