OG10语法268题及GWD22语法总结日志十五
14. Paleontologists believe that fragments of a primate jawbone unearthed in Burma and estimated at 40 to 44 million years old provide evidence of a crucial step along the evolutionary path that led to human beings.
A. at 40 to 44 million years old provide evidence of
B. as being 40 to 44 million years old provides evidence of
C. that it is 40 to 44 million years old provides evidence of what was
D. to be 40 to 44 million years old provide evidence of
E. as 40 to 44 million years old provides evidence of what was
1.主谓同等(单双数)（一级拂拭B,C,E）
fragments。。。。。。。。provide
2.简练：(一级拂拭 C. E )
what was…多余
Sth is sth.
Sth does sth.
Sth is what is sth. (错, 1.不并列, 2.用单个名词和what从句的不雅观点对称一定不对)
例句
There is speculation that increasing cold weather was what may have been responsible for the Anasazi move from Mesa Verde to sites in other canyons.
(A) that increasing cold weather was what may have been
(B) whether increasing cold weather was what was
(C) that increasingly cold weather was what had been
(D) whether increasingly cold weather may have been what was（E）
(E) that increasingly cold weather may have been
speculation that,,,,,名词Be what…..be前后的东东如果一个东东碍
3.. Estimate to be / that/ at？(词的用法二级拂拭A）estimated to be……… estimate做主动，只能是 sth. be estimated to be.......Estimate that….. estimate做主动，用estimate sth. that B中的estimated that it is it多余
It is estimated that……
At+地点, at+点时候(点和线)不能加年份的
金山词霸注释
Estimate vt. -mated, -mating估计，判定（常与that连用）估价，（常与at连用）估计
I estimate her age at 35.我估计她有35岁。
（与in连用）估计…到达
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