这道题怎么做啊?It was along the Mississippi River _______ Mark Twai

It was along the Mississippi River_____(that/where)Mark Twai it was along the mississippi river( )mark twain spent much o It was along the Mississippi River ()Mark Twain spent much o It is along the Mississippi River ____ Mark Twain spent much It was along the Mississippi River_____Mark Twain spent much Mississippi River along down the river 什么意思啊 He ___ the Huangpu River yesterday.It was his first _______ ( ) We were walking along the river _____ it suddenly began 马克吐温life on the Mississippi River 里面的一句话 Mississippi river,nabr,USA中的nabr是什么意思,怎么读? The Mississippi River is one of the longest river in the wor