The book, ____ are true stories about great scientists of the 20th century, is well worth readingA.whichB.whatC.in whichD.of which
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C解析考查定语从句。这个定语从句是一个倒装句，陈述语序true stories about great scientists of the 20th century are in which.which指代先行词the book做介词in的宾语。