The old man spoke ________ length about his experiences in Afric - 题库学习平台

The old man spoke ________ length about his experiences in Africa.
A、at
B、in
C、from
D、to
【正确答案】：A
【题目解析】：本题考查介词的辨析。at length是固定短语，表示：详细地。

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