题目内容

Mary saw her son_________the piano when she came to the room．

A. playing
B. play
C. played
D. to Cay

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A.carefulB.slowC.fastD.appropriate

A. careful
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A.muchB.oftenC.notD.very

A. much
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如果抛物线方程y2=-16x，那么它的焦点到准线的距离等于（） (A)2 (B)4 (C)8 (D)16

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