问题补充:
---- Have you been here before?
---- This is the second time I to the Great Wall.
A. comes
B. have been
C. came
D. had come
答案:
A. comes
(答案→)B. have been
C. came
D. had come
解析:考查时态:This is the 序数词或最高级+ time+从句,从句的谓语用现在完成时,句意:--以前你到过这儿吗?--这是我第二次到长城来。选B。