问题补充:
Mary is the only one of the students in our class who to the Great Wall so far.
A. is
B. has been
C. are
D. had been
答案:
A. is
(答案→)B. has been
C. are
D. had been
解析:考察时态。句意:玛丽是我们班唯一的一个目前曾经到过长城的人。可知从句中描述的是先已经完成的动作,故用现在完成时态。选B。
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