Some people believe that "King John" was written by Shakespeare, but some people think it might be written by an______author.
【正确答案】
B
【答案解析】本题空格处是说由不知名的作家所写。B项anonymous“不知名的”符合题意，如：an anonymous letter(匿名信)。其他三项delivered“在……交货的，包括运费在内的”，antique“古代的”，ambiguous“模棱两可的”都不正确。