Sometimes children have trouble _____fact from fiction and may believe that such things actually exist.

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问题 Sometimes children have trouble _____fact from fiction and may believe that such things actually exist.

选项 A、to separate
B、separating
C、for separating
D、of separating

答案B

解析 本题为搭配题,表示做某事有困难,一般用have trouble in doing something,in可以省略,所以答案为B。
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