It was along the Mississippi River Mark Twain spent much of his childhood. A. howB. which

问题补充：

It was along the Mississippi River Mark Twain spent much of his childhood.

A. how

B. which

C. that

D. where

答案：

A. how

B. which

(答案→)C. that

D. where

解析：句意：正是在密西西比河岸马克·吐温度过了他孩提时代的大部分时光。本题考查强调句。如果把It was以及that 去掉，原句就成了along the Mississippi River Mark Twain spent much of his childhood.句子仍然完整。