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 at length：最后，详细地；in full：充足，用完整的词(不缩写)；on end：连续地，通常指时间；in time：及时、最后，终于、最终。根据题意正确答案是C。three hours on end连续三个小时。

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