题目内容
Fill in the blanks with proper propositions or adverbs.
(用适当的介词或副词填空。)
The wounded diver must be operated ________ at once.
答案:on
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题目内容
Fill in the blanks with proper propositions or adverbs.
(用适当的介词或副词填空。)
The wounded diver must be operated ________ at once.