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.
语法 Sentence Correction-686
标记
正确的用户笔记
moneysharon 2015-08-04 03:21:11
[我]samples複數[正解]主詞是rock samples 所以應該要用have。此外date to be 應該改成date as
xiaolaipi 2014-12-30 13:23:01
Rock samples have been dated at 3.47 billion years old and are evidence of ....
Mikilili 2015-07-11 14:16:43
主詞是rock samples 所以應該要用have。此外date to be 應該改成date as
