Sandstorms in China appear in recent years as a result of desertification . [ ]A
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![Sandstorms in China appear in recent years as a result of desertification . [ ]A](/pic/43_1428520.jpg)
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
试题答案
C