大全987-179

xuedidage

1.       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（A）

(E) will tell an individual gene both about when it should become active and remain

That in this case refer to substances, so tell is in plural form.  

If there is no "that", then 'tell' should be 'tells', right?  

盼望 nn 解答

carolhide

那不是把逻辑意思改变了么

xuedidage

对.  但我就是说没有 that, tell 就应该是单数. 对吧?

carolhide

没有这回事啊，这样就看find的用法了

1.find sb sth

2.find that

3.find sb doing sth

4. find sth easy/difficult etc.

为什么去掉that tell会变成单数呢？我觉得去掉that句子都没办法成立了。