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  3. The water will be much more polluted unless some measures______ right now.

The water will be much more polluted unless some measures______ right now.

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问题 The water will be much more polluted unless some measures______ right now.
选项 A、will be taken
B、are taken
C、were taken
D、had been taken
答案B
解析 unless引导条件状语从句时，从句用一般现在时，主句用一般将来时。另外，从句中的measures和take为逻辑上的动宾关系，所以应用被动语态。故选B。
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