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【題目】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：他正在寫一本關于科學新發(fā)現的書。我確定，一旦這本書被出版，一定會非常受歡迎。A. once一旦；B. while而，雖然，在…期間，與…同時；C. now that既然；D. though盡管。根據句意可知選A。

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