2. 外语
  3. After he heard the news, he went to the hospital ______ once.

After he heard the news, he went to the hospital ______ once.

admin2009-07-17  33
问题 After he heard the news, he went to the hospital ______ once.
选项 A、at
B、on
C、in
答案A
解析 at once立刻，马上，固定搭配。
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