Many difficulties ——as a result of change over to a new type of fuel

分类: 作业答案 • 2021-12-28 17:14:34

问题描述：

Many difficulties ——as a result of change over to a new type of fuel
a)rose
b)arose
c)raised
d)aroused

答

b ）arose
arose是arise的过去式,意思是出现