The lecturer explained the Water Gate scandal vigorously ______ and every student was attracted by his detailed and vivid presen

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问题 The lecturer explained the Water Gate scandal vigorously ______ and every student was attracted by his detailed and vivid presentation.

选项 A、at length
B、lengthily
C、at last
D、at all

答案A

解析 固定短语辨析题。根据上下文,应该是“详尽地阐述”,所以选A  lengthily有消极含义,“冗长地”;at last意思是“终于”;at all意为“根本”。
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