2. 外语
  3. The two scholars worked at the task of writing a preface to the new dictionary for three hours _________ last night.

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

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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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