Sometimes very young children have trouble ______ fact from fiction and may believe that such things actually exist.

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问题 Sometimes very young children have trouble ______ fact from fiction and may believe that such things actually exist.

选项 A、separating
B、having separated
C、to separate
D、for separating

答案A

解析 have trouble+动词+ing是习惯用法,故C和D项可以排除。在此用法中,动词+ing一般不用完成形式,故B也可排除。
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