The main trouble is______enough knowledge.

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问题 The main trouble is______enough knowledge.

选项 A、their not having
B、them not having
C、theirs not having
D、for them to not have

答案A

解析 动名词复合结构。句意:主要的麻烦是他们的知识不够。带有逻辑主语的动名词叫做“动名词复合结构”。本题中not having enough knowledge的主语为they,因此使用动名词的复合结构,把they变成形容词性物主代词their,后面接动名词。
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