the box will -----a piece of music when you open it.（produce的什么形式?）

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• the box will -----a piece of music when you open it.（produce的什么形式?）
• the box will -----a piece of music when you open it.（produce的什么形式?）
• 完形填空 A survey _____that 30% of the students get informaton on the InternetA:puts B:shows C:buys D:has
• Hardly ____the door when he rushed into the office out of breath.30.Hardly ___________the door when he rushed into the office out of breath.A.I opened B.did I open C.I had opened D.had I opened 为啥不是B?