It took my father half an hour to finish my bike.A. repairingB. repairC. to repairD. repa

问题补充：

It took my father half an hour to finish my bike.

A. repairing

B. repair

C. to repair

D. repaired

答案：

(答案→)A. repairing

B. repair

C. to repair

D. repaired

解析：固定用法。Finish doing sth做完某事；