单项选择题

I()the Summer Palace before, but I decided to visit it a second time.

A. have visited
B. visited
C. hadn't visited
D. had visited

相关考题

telephone is really () most useful invention, don't you...

单项选择题telephone is really () most useful invention, don't you think so

A. The,/
B. The, a
C. A, /
D. / the