This is one of the best products that _____sold this year.

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This is one of the best products that _____sold this year.
A.have been B:had been C:has been
请详细点为我剖析

选A,that引导的定语从句修饰的先行词是products,复数,因此选项C排除；前面this is是一般现在时,不是过去的某个时态,所以不能用B,过去完成时,因为其表示过去的过去,在此不合适.还有就是这一句中的this
year也体现出不能选B.选A,此题表明这个动作从过去的某个时间点一直持续,并将持续下去,直到this year结束.

This is one of the best products that _____sold this year. this is one of the best films___ this year this is one of the best films that have been shown this year This is one of the best books that ______ appeared this year this is one of the best books that have been read this year. 一个题英语语法This is one of the best films____this year.A.that ha this is one of the best novels that were pullished last year This is one of the best films________this year This is one of the best books ____this year .. This is one of the best movies ___ have been shown this year this is one of the best novels (have) appeared this year.为什么 This is one of the best films_____