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Effect of Research Event on......

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单项选择题
A．to closeB．closingC．to have to closeD．for closing
A．to close
B．closing
C．to have to close
D．for closing
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
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