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接狀語的時候，謂語動詞用部分倒裝，ｔｈｅｎ這里是時間狀語，句意：當(dāng)他考試失敗了，只有那時他才意識到浪費(fèi)了多少時間。時態(tài)應(yīng)該是一般過去時，選Ｂ。
點(diǎn)評; only的倒裝句要注意一定是only后面接狀語才能倒裝，如果接主語或賓語就不是倒裝句了。
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