4．Experts think we won't have clean water to drink unless something_____soon，and much remains______ about environment protection．（　�。�
A．would be done； doingB．is done； to be done
C．will be done； to doD．is done； to do

分析 專家認(rèn)為除非采取措施，否則我們將不會有干凈的飲用水，有關(guān)環(huán)境保護(hù)還有很多要做．

解答 答案是B．本題考查被動語態(tài)；題干中第一空是unless引導(dǎo)的條件狀語從句，從句中用一般現(xiàn)在時表示將來，故排除A和C；something和do之間是被動關(guān)系，需要用被動語態(tài)，排除D；remain后接動詞不定式，且much和do之間也是被動關(guān)系，故remain后的不定式用被動結(jié)構(gòu)，即remain to be done有待被做，故選B．

點(diǎn)評 首先判斷選項(xiàng)中的動詞在句中是以謂語還是非謂語形式出現(xiàn)，然后根據(jù)選項(xiàng)在句中的功能結(jié)合非謂語的基本用法做出合理的判斷．要關(guān)注常見非謂語動詞的搭配．

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