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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


参考答案

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。
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考题 英译中:Air pollution

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考题 名词解释题大气污染(air pollution)

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