This is an illness that may result in total blindness if         .
A．being left untreatedB．left untreated
C．not left treatingD．not having left untreated
B
要做好省略結(jié)構(gòu)的題目，考生必須明白省略了哪些成分，學(xué)會(huì)將句子整合。如本題從句可補(bǔ)全為：if it is left untreated。另外，本題的另一個(gè)難點(diǎn)是：學(xué)生對(duì)untreated的用法搞不明白。老師可將此結(jié)構(gòu)先用主動(dòng)形表達(dá)，即People left the illness untreated.此處untreated作賓語(yǔ)補(bǔ)足語(yǔ)，與illness構(gòu)成被動(dòng)關(guān)系，轉(zhuǎn)換成被動(dòng)句為：The illness is left untreated.本句話語(yǔ)意為：如果不治療，這病可能會(huì)造成雙目失明。
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