几个关于省略的问题向大家请教

GabrielHong

1.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
B. Scholars thinking of Native American literatures once solely as oral narratives, and
C. Scholars who once had thought of Native American literatures solely as oral narratives and
D. Native American literatures, which some scholars once thought were solely oral narratives
E. Native American literatures, which some scholars once, thinking they were solely oral narratives
正确答案是A。但是A选项里who once thought后面跟的是一个宾语从句，我记得Gmat语法里提到宾语从句的that是不能省略的，所以我直接把A排除了，导致做错了题目，现在向大家请教宾语从句的that是否可以省略？
2、Only seven people this century have been killed by the great white shark, the man-eater of the movies—less than those killed by bee stings.
A. movies—less than those
B. movies—fewer than have been
C. movies, which is less than those
D. movies, a number lower than the people
E. movies, fewer than the ones
答案选B。但是我觉得这里than后面省略了比较从句的主语。但是只有在比较主句的主语与比较从句的主语一致时才能省略比较从句中的主语，但这里明显不一致，所以我选了E。我至今仍认为E是正确答案。希望大家能替我解惑，谢谢

花子落落

1.做题先看逻辑意思表达，再看语法。我是这么认为的
2。主语明显一样吖~都是people