Only after liberation to be treated as human beings.
A. did they begin
B. they had begun
C. they did begin
D. had they begun
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(答案→)A. did they begin
B. they had begun
C. they did begin
D. had they begun
解析：考察only的倒装。Only的倒装要满足2个条件，only放在句首，且强调的表现是状语的时候，后面的句中使用部分倒装的形式。句意：只有在解放以后，他们开始被像人一样地对待。本题的only放在句首，强调的是时间状语after liberation,故后面使用部分倒装的形式。故A正确。