题干

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
上一题 下一题 0.65难度 单项选择 更新时间:2019-03-09 12:55:22

答案(点此获取答案解析)