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【单选题】
The source of the information was never identified by anyone.
A.
necessary
B.
unnecessary
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】The letter was sent to me by a distant relative I had never met.
A.
necessary
B.
unnecessary
【单选题】The final episode of the television show was watched by over 20 million viewers.
A.
necessary
B.
unnecessary
【单选题】I can't remember where the article was first published by someone.
A.
necessary
B.
unnecessary
【单选题】My ring was found by the cab driver that was so nice to us the other day.
A.
necessary
B.
unnecessary
【单选题】The noise made by the train going by kept me up all night.
A.
necessary
B.
unnecessary