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【单选题】
I wrote a letter to John for his help during my high school years，without which I ________ the college entrance exam.A.
would fail
B.
would have failed
C.
should fail
D.
must have failed
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A.
先天固有，可稳定遗传。
B.
免疫作用广泛，无特异性。
C.
后天获得
D.
具有特异性
E.
初次与抗原接触即能发挥效应，但无免疫记忆性。
【单选题】In the United Kingdom, they have different types of schools, like state school, independent and _________ school.
A.
government-funded
B.
private
C.
special
D.
public
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