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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