2. 外语
  3. People who work in emergency services must be ready ______ at a moment’s notice.

People who work in emergency services must be ready ______ at a moment’s notice.

admin2012-04-26  36
问题 People who work in emergency services must be ready ______ at a moment’s notice.
选项 A、act
B、acting
C、acted
D、to act
答案D
解析 副词to的惯用句型be ready to do
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