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参考答案:对
—Look! The tree is growing well. When _____?
—Three years ago.[ ]
A. was it planted
B. did it plant
C. will it be planted
D. is it planted
美国的“阳光地带”是指
A.北部的五大湖区
B.东北部工业发达区
C.东西沿海平原区
D.南部和西部地区