7.It was not until all the fish in the pond died that________ the situation was serious.( 。
A.did he realizeB.he realizedC.he had realizedD.had he realized

分析 直到池塘里的魚全死了他才意識(shí)到形勢(shì)的嚴(yán)重.

解答 答案:B.根據(jù)題干中的結(jié)構(gòu):"It be not until…that…"可知,此句是not until 的強(qiáng)調(diào)句型.此句型要求把not until 置于被強(qiáng)調(diào)部分,句子剩余部分置于that后,不用倒裝.not until只有在置于句首時(shí),主句部分倒裝,其倒裝結(jié)構(gòu)為:"not until+從句(不倒)+主句(助動(dòng)詞/情態(tài)動(dòng)詞/be動(dòng)詞+主語+謂語剩余部分)".由此可知,選項(xiàng)A和D錯(cuò)誤.再由句子的時(shí)態(tài)分析可知,had done過去完成式表動(dòng)作發(fā)生在"過去的過去",即realize"意識(shí)到情勢(shì)嚴(yán)重"發(fā)生在die"魚死亡"之前,不符句意.由主從句時(shí)態(tài)保持一致可知,主句用一般過去式.故選B.

點(diǎn)評(píng) not until常考兩個(gè)結(jié)構(gòu):一倒裝"not until+從句(不倒)+主句(助動(dòng)詞/情態(tài)動(dòng)詞/be動(dòng)詞+主語+謂語剩余部分)",二強(qiáng)調(diào)"It be not until…that…".時(shí)態(tài)常為一般過去式.

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