2. 外语
  3. Professors have to keep studying the most recent developments in their major fields, or their lecture will soon be______.

Professors have to keep studying the most recent developments in their major fields, or their lecture will soon be______.

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问题 Professors have to keep studying the most recent developments in their major fields, or their lecture will soon be______.
选项 A、out of control
B、out of service
C、out of date
D、out of employment
答案C
解析 短语辨析题。C项out of date意为“过时的”；A项out of control意为“失控”；B项out of service意为“报废，停止运行”；D项out of employment意为“失业”。由or可知此处应填与前面意义相转折的短语，故答案为C。
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