Many people believe we are heading for environment disaster ________ we basically change the way we live.[ ]A. ifB. butC. unlessD. once-高中英语-n多题

◎ 题干

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

[ ]

A. if
B. but
C. unless
D. once

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◎ 解析

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◎ 知识点

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