◎ 题干
Sandstorms in China appear ____ in recent years as a result of "desertification".
[     ]
A. to increase
B. to be increasing
C. to have increased
D. increasing
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Sandstorms in China appear ____ in recent years as a result of "desertification".[ ]A. to increaseB. to be increasingC. to have increasedD. increasing…”主要考查了你对  【不定式的完成式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。