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Global warming has become a serious problem, ______ we must find solutions.
A.whichB.to which
C.with whichD.that
B

试题分析:考查定语从句。本题考查非限定性定语从句,句中先行词为problem,在从句中作solutions to的宾语。solutions to problem问题的解决方法。句意:全球变暖已经成为一个严重的问题,我们必须找到解决问题的方法。故B正确。
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