32. Tens of thousands of trees in the area in the past few years.A. have been plantedB. w

问题补充：

32. Tens of thousands of trees in the area in the past few years.

A. have been planted

B. were planted

C. have planted

D. had planted

答案：

(答案→)A. have been planted

B. were planted

C. have planted

D. had planted

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