【題目】If nothing ________, the oceans will turn into fish deserts.
A.does
B.had been done
C.will do
D.is done

【答案】D
【解析】句意:如果不采取措施,海洋將變成魚的沙漠。If引導(dǎo)的條件狀語從句中:nothing作主語,和謂語動(dòng)詞原型do構(gòu)成邏輯上的被動(dòng)關(guān)系,用被動(dòng)語態(tài)。

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