问题
选择题
—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
答案
答案：A
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—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
答案：A