问题补充:
At the age of fifteen she gave up taking piano lessons to her school work.
A. hold on
B. call on
C. put on
D. concentrate on
答案:
A. hold on
B. call on
C. put on
(答案→)D. concentrate on
解析:考查词组:A. hold on 别挂断B. call on号召C. put on穿上D. concentrate on专注于,句意:在15岁的时候,她放弃上钢琴课,专心学习。选D。