Global warming has become a serious problem, ______ we must find solutions.

A．which B．to which
C．with which D．that

B

解析試題分析：考查定語從句。本題考查非限定性定語從句，句中先行詞為problem，在從句中作solutions to的賓語。solutions to problem問題的解決方法。句意：全球變暖已經(jīng)成為一個(gè)嚴(yán)重的問題，我們必須找到解決問題的方法。故B正確。
考點(diǎn)：考查定語從句

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