题目内容
Lucy was _______ duty yesterday, but she forgot to clean the classroom.
A. in B. on C. at D. of
B 【解析】句意:露西昨天值日,但她忘了打扫教室。短语on duty:值日,值班;结合句意可知选B。
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题目内容
Lucy was _______ duty yesterday, but she forgot to clean the classroom.
A. in B. on C. at D. of
B 【解析】句意:露西昨天值日,但她忘了打扫教室。短语on duty:值日,值班;结合句意可知选B。