Who ________ a theory about black holes?
A．put forwardB．put downC．put awayD．put off
A

試題分析：考查詞組辨析：A．put forward提出，B．put down放下，記下，C．put away收好，D．put off推遲，句意是：誰(shuí)提出了黑洞的理論？選A。
點(diǎn)評(píng)：，有的詞組是由同樣的副詞或介詞和不同的動(dòng)詞搭配的，意思也不一樣。平時(shí)要注意辨別。做題時(shí)還要注意上下文。
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