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He bought over fifty books,one of ( )was an ENGLISH-CHINESE

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He bought over fifty books,one of ( )was an ENGLISH-CHINESE dictionary.
He bought over fifty books,one of ( )was an ENGLISH-CHINESE
选which.因为books后用的是逗号,前后两句之间没有连词,结构不完整,必须选择可以起连接作用的词,故用which来引导一个非限制性定语从句.值得一提的是,若books后用的是分号或句号,或者books后有连词and,就吸能用them了.