Since the early 1990s, conservationists have______protecting the Amazon in part because of its abundance of plant and animal species.
A、
called forth
B、
called back
C、
called up
D、
called for
【正确答案】
D
【答案解析】
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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