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If nothing______, the oceans will turn into fish deserts.
A.does B.had been done C.will do D.is done
D

试题分析:句意:如果没有什么可以做,海洋将会变成鱼的沙漠。因为主句是一般将来时,if引导的条件句用一般现在时代替一般将来时,所以选D。
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