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．a(chǎn)t lengthC．a(chǎn)t randomD． on average
B

試題分析：句意：有必要詳細地解釋你的理論，否則觀眾就不會明白你想要表達的意思。A. on purpose故意地；B. at length詳細地；C. at random隨意；D. on average平均。故選B。
考點: 考查介詞短語的用法。 
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