It was about 600 years______that the first clock was made.A、agoB、beforeC、since

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问题 It was about 600 years______that the first clock was made.

选项 A、ago
B、before
C、since

答案 A

解析句意：第一个时钟的发明是在600年前。本题考查的是表示时间的引导词。ago在…之前，before在…之后，since自从…。故A正确。

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