【题目】After nine years working to protect Siberian tigers, Yang Jun _____ his efforts recognized at the annual award ceremony in Beijing where he was named a "wildlife protector".
A. hadB. had had
C. has hadD. has
在线课程【答案】A
【解析】
考查时态。句意：在为保护西伯利亚虎工作了九年之后，杨军在北京举行的年度颁奖典礼上获得了“野生动物保护者”的称号。结合句意可知句子用一般过去时态，故答案为A。