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  3. The methods of communication used during the war were primitive.A reliable B eff

The methods of communication used during the war were primitive.A reliable B eff

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问题 The methods of communication used during the war were primitive.
选项 A reliable
B effective
C simple
D alternative
答案C
解析primitive的意思是“原始的”，在这里可以转义为“简单的”，故用C选项替换。
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