This is one of the best books( )on the subject.A、that have ever been writtenB、w

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问题 This is one of the best books( )on the subject.

选项 A、that have ever been written
B、which have ever been written
C、that has ever been written
D、whatever have been written

答案 A

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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Thisisoneofthebestbooks()onthesubject.A、thathaveeverbeenwrittenB、w