选择恰当的成语填空。（3分）

备选成语：卧薪尝胆    守株待兔    精卫填海    锲而不舍

悬梁刺股    艰苦卓绝    直言不讳   

执着的故事不老——愚公移山，夸父逐日，         ；执着的人物不朽——闻鸡起舞的祖逖，         的勾践，面壁静修的达摩。执着是          ，是一支永无休止符的进行曲。

The visitor asked to have his picture taken _______ stood the famous tower.

A．that

B．at which

C．when

D．where