If nothing________，the oceans will turn into fish deserts.              (2013·湖南，26)
A．doesB．had been done
C．will doD．is done
D

考查動(dòng)詞的時(shí)態(tài)和語態(tài)。句意為：如果什么都不做的話，海洋將會(huì)變成魚的沙漠。根據(jù)“主將從現(xiàn)”的原則，從句用一般現(xiàn)在時(shí)。再根據(jù)語境可知此處表示被動(dòng)。故選D項(xiàng)。
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