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标题: [求助]gwd32-q4 [打印本页]

作者: ilovecushi 时间: 2007-11-10 06:46
标题: [求助]gwd32-q4

4. GWD32-Q4

rock samples taken from the remains of an asteroid about twice

the size of the 6-mile –wide asteroid eradicated the dinosaurs

has been dated to be 3.47billion years old and thus is evidence

of the earliest known asteroid impact on earth

1) has been dated to be 3.47 billion years old and thus is

2) has been dated at 3.47 billion years old and thus

3) have been dated to be 3.47 billion years old and thus are

4) have been dated as being 3.47 billion years old and thus

5)      have been dated at 3.47 billion years old and thus
                    are

the answer given is e but, what's wrong with c ne?

is there any idiom "dated to be" or "dated at"?

help please~~

作者: rac111 时间: 2007-11-13 23:30
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作者: rac111 时间: 2007-11-13 23:35
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作者: ilovecushi 时间: 2007-11-14 03:15

以下是引用rac111在2007-11-13 23:35:00的发言：

泻泻楼上~

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