The two scholars worked at the task of w

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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.A.at lengthB.in fullC.on endD.in time

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”。句意:那两位学者昨天晚上花了三个小时为新字典写序。
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