It was about 600 years ago_____the first clock with a face and an hour hand was made.

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问题 It was about 600 years ago_____the first clock with a face and an hour hand was made.

选项 A、that
B、until
C、before
D、when

答案A

解析 此句是强调句型,强调时间状语,所以答案为A。
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