________ that is found is valuable.

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问题 ________ that is found is valuable.

选项 A、Not every pearl
B、Every pearl that is not
C、It is not every pearl
D、When not every pearl

答案A

解析 本题考查句子结构。分析句子可知,本句是一个主系表结构的句子,________that is found是主语部分,其中,that引导定语从句,在从句中作主语。由此可知,空格处应为名词性结构。选项中,只有Not every pearl为名词性结构,表示部分否定,谓语用单数,符合语义,故答案为A项。
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