单项选择题

Although punctual himself, the professor was quite used （） late for his lecture.

A. to have students
B. for students’ being
C. for students to be
D. to students’ being

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单项选择题
Sometimes children have trouble （） fact from fiction and may believe that such things actually exist.

A. to separate
B. separating
C. for separating
D. of separating
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