请教 GWD-9-Q27

easylau

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

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

2. and, if it would strike Earth, part of the planet could experience a tremendous amount of damage but it would

3. and that, if it were to strike Earth, could do tremendous damage to part of the planet but would

4. and that, if Earth is struck by it, can do part of the planet tremendous damage, but it would
5. and that, if it strikes Earth, it could experience a tremendous amount of damage but

答案是C，偶有点疑问，特别是C里的“if it were to strike Earth.."，be to do sth不是GMAT语法错误的标志吗？

LuckiPanda

be to do sth 不一定是错误标志，那得有更简洁的东西，比如有will do并且那个选项没错时才认为be to do冗长吧

这句是：某人 identified 某东西，+ 定语从句A and 定语从句B，所以结构是某人 identified 某东西，that...and that...
很冗长的结构但不是个错误结构。

第二个定从必须有that, 所以AB错

D 第二个定从缺少主语，无法确定是指earth or asteroid, 所以不可省略
E it 有歧义，无法确定是指earth or asteroid会受伤害

所以只能选C了。在过去的时间确认的（identified），所以is to be变成were to be, 合情合理。

这题没什么问题，不过是一道恶心题，故意搞那么复杂，有意思么，ETS真无聊

LuckiPanda

再次发自内心地对ETS的这种无聊行径深深鄙视

easylau

哦。。。原来是两个that并列呀。。。谢谢指导

顺便再提一下，关于be to do sth, 我听到的说法是因为这是一个很主观的表达方法，就跟be going to do一样，所以在GMAT中一定是错误的，因为GMAT中一定要是客观陈述的书面语。而不是因为简洁不简洁的问题。

不过在这题里，相比之下好像也只能选C乐

LuckiPanda

又看了一下，第二个定语从句中间插了一个类似于条件状语从句的东西，总之较复杂

就想像一下这个句子吧

I know a girl that, if she smiles at you, can make you feel faint.
Scientists identified an asteroid that, if..., could...

ivymxy

up

AlienX

what's your question?

mchome

以下是引用LuckiPanda在2007-7-21 11:00:00的发言：

E it 有歧义，无法确定是指earth or asteroid会受伤害

同一句话中的相同代词不是要指代同一个东西吗？怎能会有歧义？

AlienX

同格非形式主語, 是

luoluofly

if it were to strike Earth,表示虚拟语气，如果它撞的话会怎样怎样。。。