[求助]白勇GMAT语法全解，刘振民GMAT语法改错精解，几个相同语法点上有多处矛盾，外加几道题

近期复习语法，材料是白勇GMAT语法全解和刘振民GMAT语法改错精解，就是黄色封面那个，发现两本书在相同语法点上有多处矛盾，请大家指教

1：too adj. for sb to do 是否可行？
2：require of sb to do sth 是否可行？
3：numbers of sth 有没有这个表达形式?sth是可数还是不可数名词？
4：and，or，but～～ 此类的连接词连接的前后短语或句子是否一定要形式一致？比如：名词性名词 and 动名词性名词～～这种形式算不算对？又比如 sb and sth～对不对？
还有就是sb is negotiating and plans～～对不对？
5：that能不能指代人？
6：～～～名词a of 名词b ，which～～～（非限定性定语从句） which能否跳跃指代名词a？
7：sb do a，and do b ,and do c~~这样可以吗？三个do，三个前面都加了and

具体的题目不记得在哪一页了，但是都出自这两本书，麻烦大家花些时间指教。过两天再上来加，因为还有100页没看完呢，或者会发现更多矛盾的地方

对了，还想问问，GMAT的语法在IBT考试阅读中是否适用？特别是it，them，which的指代问题，IBT中会经常考到

Migraine,the most debilitating common form of headache, afflicts perhaps 18 million Americans, who collectively lose 64 million workdays a ___________________work time
a.  year and thus cost the nation $50 billion in medical expenses and lost
b.  year ,so as to cost the nation $50 billion in medical expenses and lost
选哪个？为啥

___________________scholars have painted a  sketchy picture of the activities of an all female cult.
a.based on accounts of various ancient writers
b.using accounts of various ancient writers
选哪个？为啥

"Mple Laf Rag" was an instant hit : it  helped establish Scott Joplin as the preeminent ragtime composer , published in 1899  and selling several hundred thousand copies in sex months.
这句话的语法有错误，错在哪里？

个人见解,希望大家提出不同意见

1.可以

2.不可行

3.numbers of sth表示许多,一些的意思,有这种表达方式. numbers of sth可以加复数名词

4.it depends,但是你举的两个例子都是可行的

5.GMAT考试中一般不用that指代人

6.根据逻辑意思具体判断which到底指代a or b

7.这个表达方法个人觉得不好,但是不确定

正确：

require sb to do sth

require that

require of sb that

sth1 required of sb to do sth2(og-181),只做定语

错误

require of sb to do

require sb doing

require sb that