Very few people understood his lecture, the subject of______was hard.A、whatB、it

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问题 Very few people understood his lecture, the subject of______was hard.

选项 A、what
B、it
C、which
D、that

答案 C

解析 本题考查非限定性定语从句。句意:很少有人理解他的演讲,它的主题很难。分析句子结构可知,逗号前后有两个谓语动词understood和was,但句子却没有连接词,因此空格处需要具有连词功能的词,故排除选项B。该句为非限定性定语从句,可以用介词of+关系代词which引导该从句。what和that均不能引导该类从句,故本题选C。
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