Remnants of a meteorite that exploded in Siberian sky and scattered over 400 square km in and around lake baikal has been dated to be 1.23 Billion years old and thus is evidence of the earliest known Meteor impact on earth.
A. has been dated to be 1.23 Billion years old and thus is B. has been dated at 1.23 Billion years old and thus C. have been dated to be 1.23 Billion years old and thus are D. have been dated as being 1.23 Billion years old and thus E. have been dated at 1.23 Billion years old and thus are
就不明白为什么thus are evidence(这样的话，evidence不是应该用复数形式么？？？evidences???) 求指导。。。
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发表于 2011-11-6 11:07:02
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