Sometimes children have trouble fact from fiction and may believe that such thin
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Sometimes children have trouble ________ fact from fiction and may believe that such things actually exist．
A.to separate
B.for separating
C.separating
D.of separating
试题答案
C
句意：有时候孩子们很难把现实与虚构区别开来，可能认为那样的事真的存在。此题用have trouble/difficulty in doing句式，介词in可省略。