––Yes, they ______ when I came back home.

A. would be completed B. would complete

C. had completed D. had been completed

【答案】D

【解析】考查被动语态。上句：修理被完成了吗？下句：是的，当我回到家的时候它们已经被完成。根据句意可知句子用过去完成时态的被动语态，故选D。