If nothing ________, the oceans will turn into fish deserts.
A．doesB．had been doneC．will doD．is done
D
句意：如果不采取措施，海洋將變成魚(yú)的沙漠。If引導(dǎo)的條件狀語(yǔ)從句中：nothing作主語(yǔ)，和謂語(yǔ)動(dòng)詞原型do構(gòu)成邏輯上的被動(dòng)關(guān)系，用被動(dòng)語(yǔ)態(tài)。
【考點(diǎn)定位】考查動(dòng)詞的被動(dòng)語(yǔ)態(tài)。
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