When he was a boy, he used to go there and watch .
A. to repair bicycles
B. bicycles to be repaired
C. bicycles being repaired
D. repairing bicycles
网友回答
A. to repair bicycles
B. bicycles to be repaired
(答案→)C. bicycles being repaired
D. repairing bicycles
解析:可联系答.案.网客服索取。