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题目内容
（陇东学院-大学英语(专升本)）
49. (单选题) ___how the splendid Maya Culture disappeared all of a sudden from the earth, it remains a mystery hard to solve.(本题1.0分)
A、 In turn
B、 As to
C、 Thanks to
D、 As a rule
A、 In turn
B、 As to
C、 Thanks to
D、 As a rule
参考答案