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问题: 请分析一道题,看究竟是什么从句,为什么?

It was about 600 years ago ______the first clock with a face and an hour hand was made .
A. that B. until C. before D. when

解答:

这是it is ...that 句型,用此句型主要为了强调it is 和that中间的部分。一般认为:被强调部分指人时,用that或who均可(强调指人的宾语时有时用whom),指事物或情况时通常用that。即使被强调部分是时间状语或地点状语时,也只能用that,不用when或where。如:
It was in the zoo that(不用where)Xiao Yang met your sister yesterday.
It was yesterday that(不用when)Xiao Yang met your sister in the zoo.


(选自张道真《实用英语语法》)

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