1. Today, widespread social pressure to immediately go to college in conjunction with increasingly high expectations in a fast-moving world often causes students to completely overlook the possibility of taking a gap year.

问题: 请教曹老师，这个in conjunction with这个结构作的是啥成分呢? 是不定式to go的伴随状语?还是pressure的定语呢? 我不会分析这个。

2.One Gallup poll found that 20 percent of Americans who have been unemployed for at least a year report having depression, double the rate for working Americans.

问题: 请教老师，这个double the rate for working Americans是啥结构呢? 主语补足语?

3.It is that gap in between, and that is where the problem is.

问题: 曹老师，这个in和between都是介词，书上解释说in between是gap的后置定语。不明白为啥要把两个介词在一块儿，它们之间不可能是介宾关系。另外，between后面为啥没有宾语呢?