Although droughts are normal for the area, scientists say the______problem is caused by global warming.

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问题 Although droughts are normal for the area, scientists say the______problem is caused by global warming.

选项 A、periodic
B、dated
C、fresh
D、current

答案D

解析空格介于定冠词the和名词problem之间。所以其中必须填入可以修饰名词的形容词。选项全是形容词，所以都有可能成为正确答案，而根据语义来分析表示“当前的，现在的”形容词current最合适。

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