---What is our earth like ________from the moon?
---Well, our earth, with water ________ 70% of its surface, appears as a "blue ball".
A．seen; coveringB．seen; to cover
C．seeing; coveredD．seeing; covering
A
考查非謂語動詞。句意：從月球上看，我們的地球像什么？——嗯，我們的地球，有水覆蓋在它70%的表面，像一個藍色的球。過去分詞表示被動的，發(fā)生過的動作，和句子主語是動賓關系。現(xiàn)在分詞表示正在進行的伴隨性的動作，和句子主語是主謂關系。結合句意可知上文為被動動作，下文為主動的伴隨性動作，故選A。
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