15. Biologists believe that they have found one of the substances that tell individual genes both when to become active and when to remain quiescent in the earliest phases of an embryo's development.
(A) tell individual genes both when to become active and when to remain (B) tell individual genes both at which time they should become active or should remain (C) tells individual genes both when to become active or remain (D) tells individual genes both when to become active or when to remain (E) will tell an individual gene both about when it should become active and remain
是不是有点弄混了呀!!如果在一个句子中,one of the substances做主语,而tell做它的谓语的话那么就是姐姐所说的要用tells了。可是问题是这里的tell做定语从句的谓语,而定语从句所修饰的却不一定是a of b的中心词吧!!有可能是b,这要看意思,就像这道题定语从句修饰的是substances所以要用tell。
以下是引用joywzy在2003-7-14 11:49:00的发言:
不对啊,A of B的中心词是A,所以one of the substances 中,tell修饰one.
以下是引用linlin315在2003-7-14 11:58:00的发言: 是不是有点弄混了呀!!如果在一个句子中,one of the substances做主语,而tell做它的谓语的话那么就是姐姐所说的要用tells了。可是问题是这里的tell做定语从句的谓语,而定语从句所修饰的却不一定是a of b的中心词吧!!有可能是b,这要看意思,就像这道题定语从句修饰的是substances所以要用tell。
没有改变啊,我的意思是:之所以要确定中心词(a of b)不就是想主谓一致吗?? 而定语从句中没有规定说这个定语从句一定就是修饰中心词的吧?that也可以修饰b这个名词啊。而且一般为了避免歧义,that都会就近修饰的。但是这也不是绝对,that修饰谁更多的要取决于意思,that这里修饰substances所以谓语当然要用tell!!不对吗?并不是说a of b的原则会因为是不是定于从句而改变。而是这里的a根本就不是定从的主语,b才是。
一般来说在A of B结构的中心词是A,后面定从修饰的是A,但这里的one of noun(pl.)结构是比较特殊的,因为one 是后面复数名词的子集,所以定从的先行词应该是这个复数名词;大家只要记住这个习惯用法就好了!
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