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 have trouble(in)doing sth.是固定搭配,作“做某事有困难”讲,短语中介词in可以省略。例如:Andy is one of the students who have trouble making up their mind.安迪是一个优柔寡断的学生。 Northerners usually have trouble understanding the southerners’accents.通常北方人难以听懂南方人的口音。
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