Question

The water in the river nearby will be dirtier than before if nothing __________.

A. has done B. will be done

C. is done D. was done

 

Answer 1

C

【解析】

试题分析：句意:如果什么措施也不采取的话，附近河里的水将会比以前更脏。if如果，引导条件状语从句，从句中用一般现在时表示将来；并且从句中的主语nothing和动词do之间构成被动的关系，应该用被动语态，故选C。

考点：考查动词的时态和语态。