Could you tell me whom the radio __ by?Sorry,I have no idea.请问这个句_英语解答

Could you tell me whom the radio __ by?Sorry,I have no idea.
请问这个句子是什么意思为什么用过去式的被动语态?
Could you tell me whom the radio __ by?Sorry,I have no idea.
C:is invented D:was invented

人气：195 ℃　时间：2019-10-17 06:01:11

解答

D 显然这个收音机已经被做出来了.