(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

(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

出自：桂林理工大学大学英语3

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