【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(guān)于科學新發(fā)現(xiàn)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(jù)句意可知選A。

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