问题
选择题
---- 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
答案：B
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。