The primitive weapon ______ from that country as it could not be traced back to

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问题 The primitive weapon ______ from that country as it could not be traced back to any other origin.

选项 A、must be introduced
B、must have been introduced
C、might be introduced
D、might have been introduced

答案 B

解析本题考查情态动词的推测。as引出来的原因状语从句含有could not(不可能)，所以答案是对过去进行肯定的推测，因而B为正确答案。句中trace back to追溯到。本句意为：这种原始武器肯定出自那个国家，因为它不可能追溯到任何其他的种族。

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