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题目内容
（南阳师范学院-教育学-大学英语（四））
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
(A) at length
(B) in full
(C) on end
(D) in time
参考答案
