He failed the mid-term examination and only then________how much time he had wasted.
A．he realizedB．did he realize
C．he had realizedD．had he realized
B

試題分析：句意：他期中考試不及格，只有到了那時(shí)，他才意識到他浪費(fèi)了多少時(shí)間。
Only+副詞/介詞短語/狀語從句等，后面的句子主體部分用倒裝結(jié)構(gòu)，即助動(dòng)詞+主語+動(dòng)詞原形，因此排除A,C。又根據(jù)句意，不是先意識到浪費(fèi)時(shí)間了，然后考試不及格，故排除D。故選B。
考點(diǎn)：
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