The two scholars worked at the task of writing a preface to the new dictionary f

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问题 The two scholars worked at the task of writing a preface to the new dictionary for three hours ______ last night.

选项 A、at length
B、in full
C、on end
D、in time

答案 C

解析 on end在此意为“接连”(continually)。

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AccordingtoOxfordEnglishDictionary,bookis""awrittenorprintedtrea