The teacher explained the difficult lesson______to the students, who still could

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问题 The teacher explained the difficult lesson______to the students, who still could not understand it.

选项 A、at random
B、at intervals
C、at liberty
D、at length

答案 D

解析 at random意为“有节奏的”；at intervals意为“时时，处处，偶尔”；at liberty意为“自由，随意”；at length意为“最后，终于”。

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