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__________ printed, this science fiction will be popular among the students.
A.BeforeB.UnlessC.Although D.Once
D
考查连词的用法。Before在……之前,Unless除非,Although虽然,Once
一旦,句意:一旦这部科幻小说被印刷,它将在学生中很受欢迎。故选Once,Once后省略了it is 。
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