By 2006 MBIA had plunged into the much riskier business of guaranteeing collateralized debt obligations, or C.D.O. 's.
到2006年，MBIA开始参与到风险更高的为担保债务凭证提供担保的业务中。
By 2006 MBIA had plunged into the much riskier business of guaranteeing collateralized debt obligations, or C.D.O. 's.
到2006年，MBIA开始参与到风险更高的为担保债务凭证提供担保的业务中。
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