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____ printed, this science fiction will be popular among the students.
A.BeforeB.UnlessC.WhenD.Once
D

试题分析:句意:一旦印刷出来,这个科幻小说将在学生中间受到欢迎的。before在……以前;      unless除非; when当……时候; once一旦。这里是once后跟省略句,完整的是once it is printed,当从句的主语与主语的一致,并且从句的谓语动词有be时,从句的主语及be都省去,根据句意故选D。
点评:本题难度适中。状语从句的省略是高中应该掌握的语法项目,需要考生牢记省略的各种情况。
需正确理解句意及正确分析句子的成分才能做出正确的判断。
即学即练:When first____to the market, the computer software was not a success due to its complexity in operation.
A. introducing                     B. being introduced
C. introduced                      D. to be introduced
解析:C。考查省略结构。在状语从句中,当主、从句主语一致,且从句中含有系动词be的各种形式时,通常将主语和系动词省略,故选C。
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