题目内容
It is a mystery __________ early men was able to construct Stonehenge without modern machines.
A. that B. when
C. why D. how
答案:D
解析:
解析:
人类多早能够不需要现代器械就能制造史前巨石柱依然是个迷。 “how”引导同位语从句。
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