When ______ through a telescope, the sun appears darker near the edge.
A. seen
B. see
C. to see
D. seeing
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While _______ the sun, the satellite has sent more than four billion bits of information back to earth.
A. orbited
B. being orbited
C. having orbited
D. orbiting
SAMBA服务器的默认安全级别是()。
A. share
B. user
C. server
D. domain
在Samba“验证模式”中有()、()、()、()和()五种模式供选择。