Since the 1950's, literary critics have attempted to answer the question: When did children's literature first emerge as a distinct literary genre?

A.improve
B.appear
C.conform
D.respond

【参考答案】

B
正确答案是：B。本题考查对单词的认知能力。本句话的意思是“自20世纪50年代以来，文学批评家们就尝试着弄清从......

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