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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单项选择题
The brothers are （） that they share all they have.

A．such good friends
B．good friends
C．so good friends
D．so very good friends
单项选择题
He often attends public lectures at the university of California chiefly （） his English.

A．to improve
B．as to improve
C．to import
D．expect for
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