Whenhewasaboy,heusedtogotherea

发布时间：2020-07-12 13:17:54

When he was a boy, he used to go there and watch _____A.to repair bicyclesB.bicycles to be repairedC.bicycles being repairedD.repairing bicycles

网友回答

C解析用-ing形式一般式的被动语态作宾语补足语，强调自行车被修理的过程。
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