About two years since the earthquake took place in Wenchuan.A. passedBhas passedC. hav

问题补充：

About two years since the earthquake took place in Wenchuan.

A. passed

Bhas passed

C. have passed

D. has been passed

答案：

A. passed

(答案→)B. has passed

C. have passed

D. has been passed

解析：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.