问题
选择题
____ from space, our earth, with water covering 70% of its surface, appears as a “blue planet.”[ ]
A. Seen
B. Seeing
C. Having seen
D. To see
答案
答案：A
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____ from space, our earth, with water covering 70% of its surface, appears as a “blue planet.”[ ]
A. Seen
B. Seeing
C. Having seen
D. To see
答案：A