It isn’t quite whether the Tibetan antelope is still being hunted.
A. certain
B. sure
C. safe
D. careful
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(答案→)A. certain
B. sure
C. safe
D. careful
解析:考查形容词:A. certain确定的,B. sure确定的,C. safe安全的,D. careful仔细的,句意:是否藏羚羊正在被捕猎还不确定。AB都有确定的意思,但sure的主语不能是it,certain可以。选A。