The reason for all the changes being made to us yet.? A.has not explained? B.has
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The reason for all the changes being made__________to us yet.?
A.has not explained?
B.has not been explained ?
C.did not explained?
D.were not explained ?
试题答案
B
yet “还没有”,表示到现在为止的情形,主句常用完成时。