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题目内容
（河北建筑工程学院-大学英语）
(单选题) The reason for all the changes being made ( ) to us.(本题1.0分)
A、 explained
B、 had explained
C、 was explained
D、 were explained
A、 explained
B、 had explained
C、 was explained
D、 were explained
参考答案
