问题: The passengers had a chat with the college students___an conductor.
The passengers had a chat with the college students___an conductor.
A.help out B.helped out C.to help out D.helping out
解答:
The passengers had a chat with the college students___an conductor. A.help out B.helped out C.to help out D.helping out
选d,相当于定语从句.who helped/was helping out an conductor
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