The reason for all the changes being made _____ to us.A was explainedB had explainedC were explainedD explained为什么?

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Thereasonforallthechangesbeingmade_____tous.AwasexplainedBhadexplainedCwereexplainedDexplained为什么?Th

The reason for all the changes being made _____ to us.A was explainedB had explainedC were explainedD explained为什么?
The reason for all the changes being made _____ to us.
A was explained
B had explained
C were explained
D explained
为什么?

The reason for all the changes being made _____ to us.A was explainedB had explainedC were explainedD explained为什么?
选A
句子的主干是:The reason was explained to us.
全句的意思是:所有产生变化的原因由人解释给我们听.

A was explained 被动