问题补充：
A Sichuan government official expressed their thanks through CCTV for the aid they in the last three years.
A. would receive
B. are receiving
C. have received
D. had received
答案：
A. would receive
B. are receiving
C. have received
(答案→)D. had received
解析：
这题考查时态，根据时间顺序，他们接受帮助应该在表达感谢之前，表示过去的过去，选D，句意是：一个四川政府官员通过CCTV表达了对过去三年中获得的帮助的感谢。
