Theimportanceofprotectingtheenviron

发布时间：2020-07-26 13:11:40

The importance of protecting the environment seemed ________ until many families lost their homes because of dust and draught.A.not to have realizedB.to have not realizedC.not be realizedD.not to have been realized

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D解析not应在to的前面。须用不定式的被动完成形式。
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