It was about 600 years ago __________ th...

It was about 600 years ago __________ the first clock was made.

A．that

B．until

C．before

D．when

A 【解析】这是一个强调句，把it was … that这个结构去掉，我们得到的是about 600 years ago, the first clock was made。根据强调句的要求，后面只能用that来连接。

考点分析：

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