摘要： 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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Many people believe we are heading for environment disaster ________ we basically change the way we
live.
live.
[ ]
A. if
B. but
C. unless
D. once
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B. but
C. unless
D. once
Many people believe we are heading for environment disaster ________ we basically change the way we live
[ ]
A．
if
B．
but
C．
unless
D．
once