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题目内容
（陇东学院-大学英语2(专升本)）
59. (单选题) What happens when sea water touches different elements ____________ another subject of study(本题1.0分)
A、 are
B、 is
C、 have been
D、 were
A、 are
B、 is
C、 have been
D、 were
参考答案
