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题目内容
（漯河职业技术学院大学英语1(高起专)）
18. (单选题) His mistake was _________ carelessness.(本题1.0分)
A、 due to
B、 as
C、 so
D、 because
A、 due to
B、 as
C、 so
D、 because
参考答案
