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�？純蓚�(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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