Since the early 1990s, conservationists have______protecting the Amazon in part

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问题 Since the early 1990s, conservationists have______protecting the Amazon in part because of its abundance of plant and animal species.

选项 A、called forth
B、called back
C、called up
D、called for

答案 D

解析各项的意思是：call forth引起，唤起；call back召回；call up召集，动员；call for呼吁。

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