There must have been someone who had informed the owner of the bathing center of the sudde

There must have been someone who had informed the owner of the bathing center of the sudden crack-down or he______able to escape the sweep.

A．wouldn"t be

B．wouldn"t have been

C．might have been

D．needn"t have been

请帮忙给出正确答案和分析，谢谢！

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