Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.
A.has been dated to be 3.47 billion years old and thus is
B.has been dated at 3.47 billion years old and thus
C.have been dated to be 3.47 billion years old and thus are
D.have been dated as being 3.47 billion years old and thus(E)
E.have been dated at 3.47 billion years old and thus are
顺便再问一个 Caribou are wary animals with excellent hearing, so stalking them over the treeless landscape, getting close enough to kill it with nothing but a handheld lance, as Dorset people did, required exceptional hunting skill. B A. so stalking them over the treeless landscape, getting close enough to kill it B. so to stalk them over the treeless landscape and get close enough to kill one C. so in order to stalk them over the treeless landscape and get close enough to kill one D. and so in order to stalk it over the treeless landscape, getting close enough to kill it E. and so stalking them over the treeless landscape and getting close enough in order to kill it 对DE的解释是：and后半句没有主句，只有so引导的结果状语，其实and多余，应该删去； 为什么说and后半句没有主句类？不是后面是stalking them and getting close enough to .......required ......？我觉得这个挺完整的。。。。。为什么嘞？
嗯 是选E的，be dated at和be dated to有一点区别： be dated at后面往往加的是xxxxyears old eg. be dated at 4,000 years old be dated to后面往往加的是具体的年份 eg.be dated to 1,000 years ago 不知道我说的清楚不？
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发表于 2011-2-10 20:59:52
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