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 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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