The water will be further polluted unless some measures ______.A、will be takenB

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问题 The water will be further polluted unless some measures ______.

选项 A、will be taken
B、are taken
C、were taken
D、had been taken

答案 B

解析表示一种假定的情况时，主句如果用一般将来时态，从句则用一般现在时态。

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