Many people believe we are heading for environment disaster ________ we basically change the way we

题目简介

Many people believe we are heading for environment disaster ________ we basically change the way we

题目详情

Many people believe we are heading for environment disaster ________ we basically change the way we
live.
[     ]
A. if  
B. but
C. unless  
D. once
题型:单选题难度:中档来源:同步题

答案

C

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