题目内容
---Excuse me, sir. Are you sure the umbrella in your hand belongs to you?
---Oh, sorry, I took it ______. Mine is over there under the chair.
A. at once B. on time C. by mistake D. in all
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题目内容
---Excuse me, sir. Are you sure the umbrella in your hand belongs to you?
---Oh, sorry, I took it ______. Mine is over there under the chair.
A. at once B. on time C. by mistake D. in all