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题目内容 (请给出正确答案)
单选题
It was from the earliest time _____ men began to study the natural phenomena and heavenly bodies.
A

when

B

where

C

that

D

how


参考答案

参考解析
解析:
从空格前内容可推知强调的是时间状语。故不可用when代替that,正确选项为C。
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