After he heard the news, he went to the hospital ______ once.A、atB、onC、inAat

游客2025-07-06 18

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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