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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

解析試題分析：句意：如果沒有什么可以做，海洋將會變成魚的沙漠。因?yàn)橹骶涫且话銓頃r(shí)，if引導(dǎo)的條件句用一般現(xiàn)在時(shí)代替一般將來時(shí)，所以選D。
考點(diǎn)：考查時(shí)態(tài)語態(tài)

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