Measures should be taken to protect our environment before it is too late.

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问题 Measures should be taken to protect our environment before it is too late.

选项 A、在太晚之前应该立即采取措施来保护环境。
B、在天黑之前,应该采取保护环境的措施。
C、应该立即采取措施保护环境,否则为时已晚。
D、应该立即采取措施保护环境,否则天要黑了。

答案C

解析
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