问题补充：
he came back the truth.
A. Not until; did he know
B. It wasn’t until; did he know
C. Not until; had he known
D. It wasn’t until that he had known
答案：
(答案→)A. Not until; did he know
B. It wasn’t until; did he know
C. Not until; had he known
D. It wasn’t until that he had known
解析：考查倒装句。当否定词或者半否定词放在句首的时候，后面的句子使用部分倒装的形式。本题的not until…直到…才…是一个否定词放在句首。故A正确。B项是强调句型，在强调句型中要使用陈述语序。D项错在时态。句意：直到他回来，才知道真相。故A正确。
