2. 外语
  3. 6Pleased with his students’ progress, Professor Tyler praised them _____________(不止一次).

6Pleased with his students’ progress, Professor Tyler praised them _____________(不止一次).

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问题 6Pleased with his students’ progress, Professor Tyler praised them _____________(不止一次).
选项
答案on more than one occasion
解析 名词“occasion”与介词“on”搭配使用。本题如果使用“once”，则不需加介词。
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大学英语四级

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