26. The secretary telephoned Mrs. Philip and found she had some available rooms.                      A                        B       C              D答案： D解析： available rooms改为rooms available；available这个形容词放在所修饰的词的后面。 27. I called at his office yesterday afternoon, but was told that he had gone half         A                                           B                Can hour ago.         D答案：  Ｄ解析：　ago改为before；这句话的意思是：我昨天下午往他办公室打电话，但是被告知他一个小时以前就已经走了。 28. Jim spent his vacation going to Mexico, flying to London， and then visited  China.                            A               B              C       D答案： D解析： visited改为visiting，注意与前面两个分词短语关系，并列关系，时态保持一致。另外，Ａ项中省略了一个介词in，spent sth (in) doing sth…，固定搭配用法，in可带可不带.  29. Despite the fact that the South Pole is as snow-covered as the North Pole,      A              B                            C is colder than the North Pole.     D答案： D解析： is colder 应改为 “it is colder”；主句缺少主语，形式主语it代指South Pole；注意：不能省略it。 30. High school students must complete course in history and sciences by the time                              A              B                            Cthey will graduate.           D答案：　D解析：　will graduate 改为graduated，用完成时表示将来时的一种用法.