2. 职称英语
  3. It was about 600 years________that the first clock was made.A、agoB、beforeC、sin

It was about 600 years________that the first clock was made.A、agoB、beforeC、sin

游客2025-06-21  23
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。since用在“从时间点开始的行动或状况一直持续到现在”的句中，主句多用完成时。如：I’ve been here since July. 我从7月份开始就在这里了。
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