Only after liberation（解放）     to be treated as human beings.
A．did they beginB．they had begunC．they did beginD．has they begun
A
考查倒裝句。當(dāng)only位于句首時，主句部分采用部分倒裝結(jié)構(gòu)，結(jié)合時間狀語after liberation解放后，可知描述的是過去發(fā)生的動作，故助動詞過去時態(tài)，選A。
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