大虾来看个题吧

szxissean

Scientists have identified an asteroid, 2000 BF19, thatis about half a mile wide and, if it strikes Earth, it can do tremendousdamage to part of the planet but probably not cause planetwide destruction.

A.   and,if it strikes Earth, it can do tremendous damage to part of the planet but

B.   and,if it would strike Earth, part of the planet could experience a tremendousamount of damage but it would

C.   andthat, if it were to strike Earth, could do tremendous damage to part of theplanet but would

D.   andthat, if Earth is struck by it, can do part of the planet tremendous damage,but it would

E.    andthat, if it strikes Earth, it could experience a tremendous amount of damagebut

答案是c,请问其中的 it were to，是个什么用法

苏木苏木

虚拟时态的其中一种用法，prep08的语法笔记里有讲或者直接搜搜论坛里