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When he was a boy, he used to go there and watched _______.  

A. repairing bicycles               B. to repair bicycles    

C. bicycles being repaired          D. bicycles to be repaired

When he was a boy, he used to go there and watched _______.   A. repairing bicycles              

B. to repair bicycles     C. bicycles being repaired          D. bicycles to be repaired