选择题:We have sometimes accidents on this line, but no a

题目内容:
We have sometimes accidents on this line, but no accident______since last winter.(本题1.0分)
A、 has been occured
B、 has occurred
C、 has been occurring
D、 is occurring
参考答案:

绝对地租的形成原因是A.土地的经营垄断B.土地的私有权垄断C.土地具有不同等级D.资本主义农业资本有

绝对地租的形成原因是A.土地的经营垄断B.土地的私有权垄断C.土地具有不同等级D.资本主义农业资本有机构成低于工业

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