I couldn’t help the computer because I was not free at that time.A. repairingB. repairC. t

问题补充：

I couldn’t help the computer because I was not free at that time.

A. repairing

B. repair

C. to repairing

D. repaired

答案：

A. repairing

(答案→)B. repair

C. to repairing

D. repaired

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