单项选择题

Sometimes very young children have trouble ______ fact from fiction and may believe that such things actually exist.

A. separating B. having separated
C. to separate
D. for separating
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Do you have any clothes ______ today the maid asked.
A. wash
B. washing
C. washed
D. to be washed
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He often attends public lectures at the university of California chiefly ______ his English.
A. to improve B. as to improve
C. except

D. except for
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