Sandstorms in Asia seem _____ in recent years as a result of desertification.
A．to increaseB．to have increased
C．having increasedD．increasing
B

試題分析：原句意思是，由于沙漠化，近幾年亞洲的沙塵暴在增長。不定式、現(xiàn)在分詞都可以作表語，表示將來的含義時，一般用不定式。不定式的完成式表示的動作發(fā)生在謂語動詞表示的動作之前，強調(diào)動作的先后順序。所以選B。
點評：本題考查的是句子的意思確定出正確的非謂語動詞形式，并使用正確的時態(tài)。
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