It was the second-hand car that the mechanic spent the whole afternoon in the factory.
A. in repair
B. repaired
C. repairing
D. to repair
网友回答
A. in repair
B. repaired
(答案→)C. repairing
D. to repair
解析：考查非谓语动词。It is … that …为强调句型，repairing the second-hand car为动名词做主语，故选C。