【题目】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】B
【解析】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。not until放在句首的时候，后面的主句是部分倒装；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。选B。