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

解析词组辨析。on end意为“连续不断地”，和表示时间的词连用；at length意为“最后，终于”；in full意为“全部地”；in time意为“及时，不迟”。

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