It is not unusual for workers in that region _____
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It is not unusual for workers in that region _____.
(A) to be paid more than a month late (C) to pay later than a month more
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A.
It's+adj.+forsb.todosth.
workers是不定式的逻辑主语，与pay之间有被动关系，排除C、D。
一个多月正确表达：morethanamonth
late作为副词，表示：迟，晚。