30.this is one ofthe best books ______ on the subject.A)that have everbeen writtenB)which have everbeen writtenC)that has everbeen writtenD)whatever havebeen written

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30.thisisoneofthebestbooks______onthesubject.A)thathaveeverbeenwrittenB)whichhaveeverbeenwrittenC)th

30.this is one ofthe best books ______ on the subject.A)that have everbeen writtenB)which have everbeen writtenC)that has everbeen writtenD)whatever havebeen written
30.this is one ofthe best books ______ on the subject.
A)that have everbeen written
B)which have everbeen written
C)that has everbeen written
D)whatever havebeen written

30.this is one ofthe best books ______ on the subject.A)that have everbeen writtenB)which have everbeen writtenC)that has everbeen writtenD)whatever havebeen written
首先best 是最高级,一定是填that,所以BD排除~
接着此定语从句的先行词是the best books,是复数,因此从句谓语用的是have~
所以选择A~

选A。限制性定于从句中,引导定语的that 和 which 在许多条件下可以互换,但是在有些条件下就不行。
本题中存在最高级 the best 因此只能用that