Not until he failed in the last examination _________ he should have spent more time on study.
A．did he realizeB．he realizedC．did he not realizeD．he didn’t realize
A

試題分析：考查倒裝句：句意：直到他在最后一次考試中失利，他才意識(shí)到他應(yīng)該在學(xué)習(xí)上多花些時(shí)間。Not until引導(dǎo)時(shí)間狀語從句置于句首，后面的主句用部分倒裝，以前前面是not until，后面是肯定句，選A。
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