GWD-17-38

modest · 发表于 2006-2-4 02:33:00

All Y chromosomes in existence today are descended from a single ancestor’s who is thought to have lived about 140,000 years ago.

a single ancestor’s who is thought to have lived

a single ancestor’s who was thought to live

a single ancestor whom it is thought had lived

the Y chromosome of a single ancestor who is thought to have lived

the Y chromosome of a single ancestor whom it was thought had lived

key

but how can "have lived" comes with 140,000 years ago? I think the answer should be B.

wycg · 发表于 2006-2-4 10:41:00

以下是引用modest在2006-2-4 2:33:00的发言：

All Y chromosomes in existence today are descended from a single ancestor’s who is thought to have lived about 140,000 years ago.

key

but how can "have lived" comes with 140,000 years ago? I think the answer should be B.

同意D.

to have done, 表完成.

modest · 发表于 2006-2-7 05:25:00

如果是完成，140，000 years就可以了。加上ago，怎么表示从过去到现在呢？

zhiyuan · 发表于 2006-2-7 06:24:00

ancestor’s后面应接whose

zyzcdcdcd · 发表于 2006-10-7 16:35:00

不定式的完成时仅仅表示动作发生在前面那个动词之前，没有延续到现在的意思

candylovesu · 发表于 2007-8-30 13:55:00

A.B.C都不能用，因为染色体不是生命，只能用of所有格

冰晶火 · 发表于 2008-7-15 12:32:00

GWD17-Q38:

All Y chromosomes in existence today are descended from a single ancestor’s who is thought to have lived about 140,000 years ago.

答案D

Q41. GWD-12-Q28:

Some scientists contend that many species of dinosaur had a metabolism more like a warm-blooded mammal’s than a cold-blooded reptile’s.

正确答案A

看来‘s 和of 都是可以的不过同时出现时of 优先

tonylin0824 · 发表于 2009-3-19 13:19:00