题目内容
【题目】Mary ________ a math problem with her classmates when the math teacher knocked at the door.
A.has discussedB.discussedC.was discussingD.discusses
【答案】C
【解析】
略
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题目内容
【题目】Mary ________ a math problem with her classmates when the math teacher knocked at the door.
A.has discussedB.discussedC.was discussingD.discusses
【答案】C
【解析】
略