问题
选择题
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
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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：A