问题补充：
--Did you listen to the report last Friday?
--- Yes, it was about the shortage of migrant workers. That was the first time I about the subject.
A. heard
B. was hearing
C. would hear
D. had heard
答案：
A. heard
B. was hearing
C. would hear
(答案→)D. had heard
解析：考查动词时态。句义：你听上周五的报告了吗？是的，是关于工人的短缺的，那是我第一次听到这个主题。把握关键短语hat was the first time，构成固定句型this/that/it was the first time +主语 + had done，所以D正确。
