题目

---Tom failed again!    ---If he had spent as much as he _______ on computer games.    A. has                            B. had                          C. did                   D. would 答案：C5．现代农业提高产出的最重要手段是（　　）A．化肥、农药大量投入B．农具的更新C．增加劳力D．加大科技投入