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(shí)到他浪費(fèi)了多少時(shí)間。
Only+副詞/介詞短語(yǔ)/狀語(yǔ)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(yǔ)+動(dòng)詞原形,因此排除A,C。又根據(jù)句意,不是先意識(shí)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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