单选题—The air pollution is terrible.—It will be worse ______we take action to protect the environment.AifBunlessCuntilDwhen
单选题
—The air pollution is terrible.—It will be worse ______we take action to protect the environment.
A
if
B
unless
C
until
D
when
参考解析
解析：
句意：—空气污染很严重。—这将会更严重，除非我们采取行动来保护环境。本题考查连词的用法。根据上下文句意可知此处应填入B项unless“除非”。if如果。until直到。when当……时候。
句意：—空气污染很严重。—这将会更严重，除非我们采取行动来保护环境。本题考查连词的用法。根据上下文句意可知此处应填入B项unless“除非”。if如果。until直到。when当……时候。
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