解析 unless引导条件状语从句。unless=if not如果不。句意:你最终会成功除非你中途放弃。答案 unless______ his mother came back from work.
解析 until引导时间状语从句。not...until...直到……才……。句意:直到他妈妈下班回来才上床睡觉。答案 until________ I could ask him.
解析 before引导时间状语从句。before在…答案 before______ you have remembered it.
解析 until引导时间状语从句。until直到。句意:请一直读这首诗直到你记住它。答案 until how long it will be ______ a new drug is invented for AIDS?
解析 考查before引导的时间状语从句。此为It will be+时间段+before(……多久之后才……)结构的变形。how long 后的从句作imagine的宾语要用陈述句语序。答案 before______ you understand the rule,you will find it very easy to obey.
解析 once引导条件状语从句。once一旦。句意:一旦你明白了规则你就会发现很容易遵循。答案 Once______ in Beijing,I paid a visit to the Summer Palace.
解析 此题考查while引导的时间状语从句。当be动词。句意:在北京期间我参观了颐和园。答案 While完形填空 体裁:说明文 话题:计算机科学 时间:15分钟mputer virus” is the __1__ between the biological virus and the evil program infected with computers.The __2__ of this term came from an American science fiction “The Adolescence of P-1”__3__ a living cell and turn it into a factory for __4__ viruses.However,computer viruses are small programs.They copy by attaching a copy of themselves to another program.
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