24. The two scholars worked at the task of writing a preface to the new dictionary for three hours ____ last night.　 (A) at length (B) in full (C) on end (D) in time

24.
The two scholars worked at the task of writing a preface to the new dictionary for three hours ____ last night.　
(A) at length
(B) in full
(C) on end
(D) in time

出自：郑州工程技术学院-大学英语（2）.

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