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    精英家教网 > 高中英语 > 题目详情
    It is necessary to explain your theory _____, otherwise the  audience won't make sense of what you are trying to get across.
    A．on purposeB．at lengthC．at randomD． on average
    B

    试题分析：句意：有必要详细地解释你的理论，否则观众就不会明白你想要表达的意思。A. on purpose故意地；B. at length详细地；C. at random随意；D. on average平均。故选B。
    考点: 考查介词短语的用法。 
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