33.【2019 •广东省】My father ____ in a panda protection center for 10 years, so he knows a lot about panda.
   A. was working B. is working
   C. has worked D. will work
【答案】C
【解析】由“for 10 years”可知，此处要用现在完成时。此处指我爸爸已经在熊猫保护中心工作10年了。