第90句：

Professor Johnson,last nigh when I was putting the finishing touches on my paper,a computer failure completely wiped out my files.Do you think I can have another day to retype it?

六级词汇讲解:
本句的句式结构较简单，主要涉及when引导的时间状语从句。
touch的意思是“(细节中的)微小之处”，put the finishing touches onlto sth.表示“对……做最后修改”。如:
The artist was putting the finishing touches on a piece of work.
那位艺术家正在对一件作品做最后的修改。
computer failure指“计算机故障”。wjpe out的意思是“擦掉;消灭”。如:
The attack is to wipe out data, to delete files, or to format the hard disk.
攻击方式是消除数据、删除文件或格式化硬盘。

六级考点归纳：
与put有关的短语在四、六级考试中经常出现，较难理解的主要包括:
put through接通;完成或达成(计划、方案等);使某人经受(苦难、考验等)
put acrosslover沟通或传达(思想等);解释清楚
put in正式提出某事物;呈交某事物