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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, realizedB.had caused, realized
C.caused, had realizedD.was causing, had realized
B
考查时态。not until引导的状语从句,从句用过去完成时,主句用一般过去时,故选B。
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