Mark Twain along the Mississippi River which was to his writing.A. was grown up / benef

问题补充：

Mark Twain along the Mississippi River, which was to his writing.

A. was grown up / benefit

B. brought up / benefit

C. grew up / of beneficial

D. was brought up / beneficial

答案：

A. was grown up / benefit

B. brought up / benefit

C. grew up / of beneficial

(答案→)D. was brought up / beneficial

解析：句意：Mark Twain在密西西比河沿岸长大，这对他的写作很有益。grow up用主动形式，be brought up是用被动形式；beneficial是形容词，相当于be of benefit，故选D。

考点: 考查时态和词类的用法。