magoosh求分析句子结构，没看懂

雪中飞舞888UID: 3609847

Collaboration between students, while promising—students who work together rarely are in the bottom half of the class—does not tend to account for the success of students at the very top of the class, students who work  ______________.

1autonomously 2sporadically 3diligently4 independently 5efficaciously 6without interruptions

糊涂制胜UID: 3454434

Collaboration between students, while promising—students who work together rarely are in the bottom half of the class—does not tend to account for the success of students at the very top of the class, students who work  ______________.

zoefengUID: 3534885

是选Independent吗，感觉是选together的反义词

cpsencyclopediaUID: 3608312

我怎么觉得1,4都可以啊

谁来解释下

雪中飞舞888UID: 3609847

cpsencyclopedia 发表于 2015-4-29 00:54
我怎么觉得1,4都可以啊

谁来解释下

答案是1,4

雪中飞舞888UID: 3609847

糊涂制胜 发表于 2015-4-26 11:56
Collaboration between students, while promising—students who work together rarely are in the bottom ...

谢啦，刚开始没看懂那个破折号是什么用的