题目内容
17．The air pollution is terrible．---It will be worse _______we take measures to stop it．（ ）
| A． | if | B． | unless | C． | though |
分析 -空气污染太糟糕了．
-如果我们不采取措施，那么污染将更严重．
解答 正确答案：B．
if引导条件状语从句，表示如果．unless也引导条件状语，表示除非、如果不，相当于if…not…．though引导让步状语从句，表示即使、虽然．根据句意除非我们采取措施，不然污染将更严重可知此处该填写unless，故选择B．
点评 本题考查从属连词，需熟悉连词用法及其引导的从句，再根据主从句关系作出选择．
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