问题补充：
Not until he went through real hardship the love we have for our families is important.
A. had he realized
B. did he realize
C. he realized
D. he had realized
答案：
A. had he realized
(答案→)B. did he realize
C. he realized
D. he had realized
解析：考查部分倒装句和时态。not until这样的否定词放在句首的时候，后面的主句是部分倒装，就是将be动词，助动词或情态动词放在主语前面，而且这句话的从句是过去时，主句的动作发生在从句的动作前面，不可能是过去完成时，用一般过去时。句意：直到他经历了真正的困难，他才意识到我们对家庭的爱是很重要的。选B。
【考点定位】考查部分倒装句和时态
