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 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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