The water in the river nearby will be dirtier than before if nothing __________.

A．has done B．will be done
C．is done D．was done

C

解析試題分析：句意:如果什么措施也不采取的話，附近河里的水將會(huì)比以前更臟。if如果，引導(dǎo)條件狀語(yǔ)從句，從句中用一般現(xiàn)在時(shí)表示將來(lái)；并且從句中的主語(yǔ)nothing是動(dòng)詞do的承受著，應(yīng)該用被動(dòng)語(yǔ)態(tài)，故選C。
考點(diǎn)：考查一般現(xiàn)在時(shí)被動(dòng)語(yǔ)態(tài)。

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