Question

____ from the moon, our earth with water _____ se

venty percent of its surface, appears as a blue ball. [ ]
A. Seen, covered
B. Seeing, covering
C. Seen, covering
D. Seeing, covered

Answer 1

C
第一个空填seen，因为our earth is seen from the moon，被动用过去分词结构；
第二个空填covering，因为water covers seventy percent of its surface，主动用现在分词结构。