18．We werewitnessing（見(jiàn)證） the most important scientific development of the century．

分析 我們親眼見(jiàn)到本世紀(jì)最重要的科學(xué)發(fā)展．

解答 答案是witnessing．本題考查詞匯短語(yǔ)的語(yǔ)境運(yùn)用；witness及物動(dòng)詞，見(jiàn)證；其后不缺賓語(yǔ)，所以不需要用被動(dòng)；根據(jù)題干中的were和語(yǔ)境判斷句中需要進(jìn)行時(shí)，故答案是witnessing．

點(diǎn)評(píng) 翻譯填空要根據(jù)所提供的漢語(yǔ)意思結(jié)合語(yǔ)境和句子結(jié)構(gòu)選擇恰當(dāng)?shù)脑~、短語(yǔ)或句型；同時(shí)注意句子結(jié)構(gòu)和所選詞的形式變化．

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