Question

Sometimes children have trouble ________ fact from fiction and may believe that

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

Answer 1

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。