6．Sandstorms in that area appear        in recent years as a result of"desertification"．（　�。�
A．having increasedB．to increase
C．increasingD．to have increased

分析 由于"荒漠化"，中國近年來發(fā)生沙塵暴的次數(shù)明顯增加了．

解答 答案：D．
動詞appear后面跟動詞作賓語時通常用不定式，根據(jù)后面的時間狀語in recent years可知，用完成時更合適，表示似乎已經(jīng)做過某事；故選D．

點評 對于非謂語動詞的考查要熟悉他們的具體用法和意義，這對于解題很重要．

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