大全13-27，逻辑意思相近，头晕。

27.   A recent study of ancient clay deposits has provided new evidence supporting the theory of global forest fires ignited by a meteorite impact that contributed to the extinction of the dinosaurs and many other creatures some 65 million years ago.

(A) supporting the theory of global forest fires ignited by a meteorite impact that

(B) supporting the theory that global forest fires ignited by a meteorite impact

(C) that supports the theory of global forest fires that were ignited by a meteorite impact and that

(D) in support of the theory that global forest fires were ignited by a meteorite impact and that

(E) of support for the theory of a meteorite impact that ignited global forest fires and

答案是B。A,B,C比较难把握，单独拿出来看起来都对。如何筛选呢？在这种情况下，有没有supporting比that更好修饰evidence的说法？

此题关键在逻辑关系，我对og解释的总结感觉ing更多做modifier,that更多做解释成份，不过这个只是大数定律，不能作为规律。你仔细研究一下句子的逻辑关系就知道为什么选B了。

这个evidence支持了这样一个theory, theory之后的that全部都是theory的内容，global forest fires是contributed的主语， ignited by a meteorite impact是global forest fires的修饰成分。 其他选项都不对。此句逻辑关系复杂，易错。

kally MM真早。谢谢你的答疑。
我又看了好几遍，感觉做题时脑子不太清楚。用OG的方法试着解释一下。
A.supporting the theory of global forest fires ignited by a meteorite impact that
that从句有歧义，既可能是global forest fires或a meteorite impact导致extinction，尽管that的先行词是a meteorite impact，因为都讲得通
B.(B) supporting the theory that global forest fires ignited by a meteorite impact
好像没错
C. that supports the theory of global forest fires that were ignited by a meteorite impact and that
that有歧义，不知道是和evidence并列还是与global forest fires
然后再根据逻辑意思，B是最优的。

我对og解释的总结感觉ing更多做modifier,that更多做解释成份，那么MM对下面这题怎么看？

3.     As litigation grows more complex, the need th at experts explain technical issues becomes more apparent.

(A) that experts explain technical issues becomes

(B) for experts to explain technical issues became

(C) for experts to explain technical issues becomes

(D) that technical issues be explained by experts became

(E) that there be explanations of technical issues by experts has become
Choice C。其实A就是同位语从句，感觉上比不定式更完整呀？

3.     As litigation grows more complex, the need th at experts explain technical issues becomes more apparent.

(A) that experts explain technical issues becomes

(B) for experts to explain technical issues became

(C) for experts to explain technical issues becomes

(D) that technical issues be explained by experts became

(E) that there be explanations of technical issues by experts has become
Choice C。其实A就是同位语从句，感觉上比不定式更完整呀？

我说的那句话后面加了一句不可作为规律。
你举的这个例子用到了一个习惯用法the need for sb. to do sth.

谢谢了。