问题补充:
John kept looking at the pretty girl, wondering whether he her somewhere.
A. saw
B. has seen
C. sees
D. had seen
答案:
A. saw
B. has seen
C. sees
(答案→)D. had seen
解析:句意:约翰一直看着这个漂亮的女孩,想知道他在什么地方看见过她。从前面的John kept looking at the pretty girl,可知这里是过去的过去的动作,用过去完成时,所以选D。