It was not until the subprime loan crisis（次贷危机） ____ great damage to the America
题型：不详难度：来源：
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 |
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答案
| B |
解析
| 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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