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【题目】He is writing a book about new discoveries in science. I am sure, _________ it is printed, this book will be very popular.

A. once B. while

C. now that D. though

【答案】A

【解析】句意:他正在写一本关于科学新发现的书。我确定,一旦这本书被出版,一定会非常受欢迎。A. once一旦;B. while虽然在…期间与…同时;C. now that既然;D. though尽管根据句意可知选A。

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