问题
选择题
How ______ universe came into being is a puzzle to ______ scientists of all generations.
A. the; 不填 B. an; the C. a; 不填 C. 不填；the
答案
答案：A
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How ______ universe came into being is a puzzle to ______ scientists of all generations.
A. the; 不填 B. an; the C. a; 不填 C. 不填；the
答案：A