(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(shí)態(tài)和語(yǔ)態(tài)。首先nothing與do之間為被動(dòng)關(guān)系，排除A、C兩項(xiàng)；根據(jù)主句的一般將來(lái)時(shí)態(tài)可知，if引導(dǎo)的條件狀語(yǔ)從句使用一般現(xiàn)在時(shí)態(tài)。故選D。

 

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