The policy ______ made, :the next problem was how to carry it out.A、having been

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问题 The policy ______ made, :the next problem was how to carry it out.

选项 A、having been
B、being
C、had been
D、was

答案 A

解析考查独立主格结构，且根据句意，时态应该是完成时，所以正确答案是A。

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