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

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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