High scores on the GRE helped explain who got in; degrees of prestigious universities didn't.
本句由两个分句构成，第一个分句的主干是...scores... helped explain...，其中who got in为宾语从句，充当explain的宾语；第二个分句的主干是degrees...didn’t，省略了谓语help。
The football player can get in any team.
She won a prestigious literary prize when she was 47.
Thank you for your help.
Have a good time.
They shook hands and( they) began to talk at once.
( Does) Anybody need help?
(Is there) Anything you want?
Some of us study French，and others(study) German.
Mary is going to sweep the floor though Alice isn't（going to sweep）．
( Do you) Understand?
(I am) Afraid I can’t come.
She hurried away as if( she was) angry.
It was not so hot yesterday as (it is) today.
I like jogging better than（I like）going swimming.
You are a college student, aren't you?(=aren't you a college student?)
He tried to call his wife but (he tried) in vain.
It is a pity( that) he can't come.
He said (that) he would come to see me.
The iPad( which)1 wanted to buy was sold out.
The actress（whom/who/that）he admired so much died last week.