求大神解答，为什么有题答案宾语从句不加that

Enid11111

Scholars who once thought Native American literatures were solely oral narratives recorded by missionaries or anthropologists now understand this body of work to consist of both oral literatures and the written works of Native American authors, who have been publishing since 1772.
A     Scholars who once thought Native American literatures were solely oral narratives  分析A选项
B     Scholars thinking of Native American literatures once solely as oral narratives, and  分析B选项
C     Scholars who once had thought of Native American literatures solely as oral narratives and  分析C选项
D     Native American literatures, which some scholars once thought were solely oral narratives  分析D选项
E     Native American literatures, which some scholars once, thinking they were solely oral narratives  分析E选项


求问这一题！！为什么A选项宾语从句不加thought后面不加that 竟然是对的

mnimi

宾语从句不是必须加that,有些特殊情况that不能省，比如： http://www.zybang.com/question/818c0d2fbecdf4b88f4c5a04aca33bf6.html
另外GMAT超灵活的，只有及其个别的时候可以记住一些规则来用。