He failed in the exams and only then _____ how much time he had wasted.
A．he realizedB．did he realizeC．he had realizedD．had he realized
B

試題分析：考查ｏｎｌｙ的倒裝句，ｏｎｌｙ接狀語(yǔ)的時(shí)候，謂語(yǔ)動(dòng)詞用部分倒裝，ｔｈｅｎ這里是時(shí)間狀語(yǔ)，句意：當(dāng)他考試失敗了，只有那時(shí)他才意識(shí)到浪費(fèi)了多少時(shí)間。時(shí)態(tài)應(yīng)該是一般過(guò)去時(shí)，選Ｂ。
點(diǎn)評(píng); only的倒裝句要注意一定是only后面接狀語(yǔ)才能倒裝，如果接主語(yǔ)或賓語(yǔ)就不是倒裝句了。
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