To understand the plex situation pletely requires more thought than so far.
A. gave
B. has given
C. has been given
D. is being given
网友回答
A. gave
B. has given
(答案→)C. has been given
D. is being given
解析:由so far 可知用现在完成时,因为so far是现在完成时的标志,由语意知此处为被动,因此选择C项