从 A、 B、 C、 D四个选项中，选出可以填入空白处的最佳选项。 21. -Dont press the button, John? -What if I _？ A. did B. would C. will D. shall 22. Bob has been working hard in an attempt to have his pay _ as soon as possible. A. raised B. risen C. arisen D. lifted 23. He is rather difficult to make friends with, but his friendship, _, is more true than any other. A. when to gain B. once gained C. after is gained D. while gaining 24. Color blind people often find it difficult to _ between blue and green. A. separate B. tell C. compare D. distinguish 点击下载：http:/
