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

解析词组和固定搭配。at length意为“详细地”，in full意为“重足”，on end意为“连续地”，in time意为“及时”。

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