Not until he left his home _____ to know how important the family was for him.
A．did he beginB．had he begunC．he beganD．he has begun
A

試題分析：句意：直到他離開家，他才意識到家庭對于他來說是多么的重要。這里not until放在句首句子，這里的主句用部分倒裝。根據(jù)主句的謂語動詞用的是過去式可知這里空格處也應該用過去式，故選A。
點評：本題難度適中。倒裝句是高中階段必須掌握的語法項目，它分為部分到裝和全部倒裝，情況復雜，需要考生熟記它們的用法。
即學即練：—How was the weather then?
—Hardly_____off the plane，when it started to rain.
A.I had stepped                 B.had I stepped
C.I stepped                      D.did I step
解析：B。hardly, seldom等否定副詞位于句首作狀語時，后面要用部分倒裝，再由句意可知，選B。
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