______from space, the earth, with water _____seventy percent of its surface looks like a blue ball.
A.Seen; coveredB.Seen; coveringC.Seeing; coveredD.Seeing; covering
B

這題考查非謂語動詞的用法:第一空填seen,是過去分詞做狀語,因為the earth和see是被動關(guān)系,第二空填covering是with復(fù)合結(jié)構(gòu),因為water和cover 是主動關(guān)系。選B。
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