Scientists have identified an asteroid, 2000 BF19, that is about half a mile wide and that, if it were to strike Earth, could do tremendous damage to part of the planet but would probably not cause planetwide destruction.
就对了,并且明确表示”if it were to strike Earth用了正确的语态“。
但是OG里有一题出现which非限定修饰的选项矛盾时,ETS又用”be to do是错误用法“来排除了一个其他方面看起来对的选项