I failed in the last exam and only then __________ the importance of studies.
A．I realizedB．I had realizedC．had I realizedD．did I realize
D
考查倒裝句。Only +狀語(yǔ)放在句首時(shí)，應(yīng)使用部分倒裝，根據(jù)題中的時(shí)間狀語(yǔ)是then，故用過(guò)去式，助動(dòng)詞did前提，所以選D，句意：上次考試我失敗了，只有到了那個(gè)時(shí)候，我才意識(shí)到了學(xué)習(xí)的重要性。
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