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】
[解析] 因为先行词是复数，并且由形容词的最高级来修饰，所以只能选A。本句的意思是：“这是有关这个主题写得最好的书之一。”
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