_______ from the moon, our earth, with water _______seventy percent of its surface, appears a blue ball
A．Seen; coveredB．Seeing; covering
C．Seen; coveringD．Seeing; covered
C
考查非謂語動詞用法。第一空考查分詞做狀語，see與our earth構(gòu)成被動關(guān)系，故使用過去分詞的形式。第二空是with復合結(jié)構(gòu)，water與cover構(gòu)成主動關(guān)系，使用現(xiàn)在分詞的形式。句意：從月球上看，由水覆蓋著百分之70表面得地球好像是一只藍色的球。故C正確。
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