This is one of the best books ________ this year．A.they have been readB.that has been readC.that have been readD.which has been read
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C解析在定语从句中，当先行词前面有very, only, last及形容词的最高级等修饰时，常用that作引导词．本句的先行词是复数名词books，故定语从句的谓语用复数．若选A项，they是read动作的执行者，应用主动式，即须将been去掉．