The editor asked me to write another article for them about environmental protection.A. a

问题补充：

The editor asked me to write another article for them, about environmental protection.

A. any

B. one

C. that

D. each

答案：

A. any

(答案→)B. one

C. that

D. each

解析：不定代词one这里用作同位语，代替article，表示泛指。