题目内容
Many people believe we are heading for environmental disaster _________ we radically(彻底地)change the way we live.
[ ]
A.
but
B.
although
C.
unless
D.
until
答案:C
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题目内容
Many people believe we are heading for environmental disaster _________ we radically(彻底地)change the way we live.
but
although
unless
until