Question

1，It was along the Mississippi River_____Mark Twa

1，It was along the Mississippi River_____Mark Twain spent much of his childhood.这个空填什么。，为什么这么填的啊？？？？？？
2，It wasn't until nearly a month later______I received radio boardcasts began.这个该如何填呀为什么啊？？？？？

Answer 1

1. that，强调句。强调句的结构为：It be + 需强调部分+that+句子剩余部分。需强调部分一般是，主语、宾语、主补、状语。此题强调的是地点状语。强调句有一个特点是，把it be...that 去掉之后，剩余部分是可以连成正确的句子的。所以你可以这样看：Mark Twain spent much of his childhood along the Missippi River. 题目是把地点状语搬到前面做成被强调部分了。

2. that，仍然是强调句。强调的是时间状语，只不过把原句中的否定not提前到be后面了，原句应该是：I didn't receive radio broadcasts until nearly a month later.（不知道你的began是怎么回事？） 

Answer 2

that when