The origin of life on earth is question that interests astronomers.（原创）A. the; the B. \;

问题补充：

The origin of life on earth is question that interests astronomers.（原创）

A. the; the

B. \; a

C. \ ; the

D. the; a

答案：

A. the; the

(答案→)B. \; a

C. \ ; the

D. the; a

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