It was not until the subprime loan crisis（次貸危機(jī)） ____ 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
考查時(shí)態(tài)。not until引導(dǎo)的狀語從句，從句用過去完成時(shí)，主句用一般過去時(shí)，故選B。
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