题目内容

句型转换:根据前面所给的句子完成后面的句子,使其意思不变,每空一词

It is yet not known how these were conveyed over a distance of 380 kilometers.

People ________ ________ ________ how these were conveyed over a distance of 380 kilometers.

答案:
解析:

still, don't, know


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