句型轉(zhuǎn)換：根據(jù)前面所給的句子完成后面的句子，使其意思不變，每空一詞

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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