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

考查時態(tài)和語態(tài)。首先nothing與do之間為被動關(guān)系，排除A、C兩項；根據(jù)主句的一般將來時態(tài)可知，if引導(dǎo)的條件狀語從句使用一般現(xiàn)在時態(tài)。故選D。
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