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

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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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