题目内容
【题目】Helen spent three hours ________ the task. She is tired now.
A.completeB.completingC.to completeD.completed
【答案】B
【解析】
略
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题目内容
【题目】Helen spent three hours ________ the task. She is tired now.
A.completeB.completingC.to completeD.completed
【答案】B
【解析】
略