单项选择题

A．to close
B．closing
C．to have to close
D．for closing
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单项选择题
The principle underlying all treatment of developmental difficulties in children ______.
A．is to send them to clinics
B．offers recapture of earlier experiences
C．is in the provision of clockwork toys and trains
D．is to capture them before they are sufficiently experienced
单项选择题
A．a soB．soC．such aD．such
A．a so
B．so
C．such a
D．such
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