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(2013·湖南，26)If nothing________，the oceans will turn into fish deserts.

A．does B．had been done

C．will do D．is done

 

D

【解析】

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

 

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