It was not until the subprime loan crisis(次贷危机) ____ great damage to the American

It was not until the subprime loan crisis(次贷危机) ____ great damage to the American financial system that Americans ____ the severity of the situation.

A. caused, realized                                    B. had caused, realized

C. caused, had realized                               D. was causing, had realized

答案

B


解析:

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