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  3. Nearly two thousand years have passed______ the Chinese first invented the compass.

Nearly two thousand years have passed______ the Chinese first invented the compass.

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问题 Nearly two thousand years have passed______ the Chinese first invented the compass.
选项 A、when
B、before
C、since
D、after
答案C
解析 since引导的时间状语从句表示“自从……以来”，用法主要有两种：(1)现在完成时的主句+since引导的一般过去时态的时间状语从句。如：They have been friends ever since they were in grade school．他们从小学起就一直是朋友。(2)It be(主句中谓语用一般式和完成式区别不大，后者更具强调意味)+表示一段时间的词汇+since引导的时间状语从句。如：It is two years since I became a postgraduate student．我成为研究生已两年了。It was three years since we had been there．我们在那儿已待了三年。本句属于第一种情况。
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