单选题
This is one of the best books ( )on the subject.
A、
that have ever been written
B、
which have ever been written
C、
that has ever been written
D、
whatever have been written
【正确答案】
A
【答案解析】
本题考查定语从句。先行词是复数，并有形容词最高级best修饰，所以只能用that引导。
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