necessary to explain your theory _____, otherwise the audience won’t make sense of what you are trying to get across. A:on purpose B. at length C. at random D. on average; B【解析】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
D:on average;
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