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A
hadn‘t acted
B
haven‘t acted
C
don‘t act
D
won‘t act
正确答案 :C
解析
本题考查动词时态。
句意为“如果我们不行动起来保护环境,我们会后悔的。”根据主句的时态及从句中的now可知,条件从句要用一般现在时态,故选C。
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