题目内容
About two years ________ since the earthquake took place in Wenchuan.
| A．passed | B． has passed | C．have passed | D．has been passed |
B
试题分析：句意：自从汶川地震发生，已经大约两年过去了。since自从，引导的时间状语从句为一般过去时，主句为现在完成时，two years做为一个整体，视为单数，故选B.
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