摘要： Many people believe we are heading for environmental disaster we basically change the way we live. A. but B. although C. unless D. once
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Many people believe we are heading for environmental disaster _____ we basically change the way we live.
| A．but | B．although | C．unless | D．once |
Many people believe we are heading for environmental disaster _____ we basically change the way we live.
A．but B．although C．unless D．once
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Many people believe we are heading for environmental disaster _____ we basically change the way we live.
A. but B. although C. unless D. once
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