单项选择题 It took me a long time before I was able to fully appreciate what they __ for me.A. had doneB. did C. would do D. were doing

单项选择题 Part of the reason Charles Dickens loved his own novel, David Copperfield, was__ it was rather closely modeled on his own life.A. what B. that C. why D. whether

多项选择题 政府外债项目资金申请报告中的项目概况通常包括（）