题目

 _______, I lost heart in English learning, but my teacher said to me, “Keep on working hard, and you’ll succeed ________.”  A. At a time; in time                                        B. At one time; in time           C. At a time; on time                                       D. At one time; on time盒子中有3个红球、5个黄球，大小形状完全相同．程浩摸到红球获奖，小畅摸到黄球获奖．要使两人获奖具有公平性，应该（　　）A．把一个黄球换成红球B．去掉一个黄球C．增加一个黄球去掉一个红球D．增加一个红球