单项选择题


A．since
B．as
C．because
D．for
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单项选择题
A．highestB．higherC．highD．highly
A．highest
B．higher
C．high
D．highly
单项选择题
A．painedB．painfulC．painingD．pain
A．pained
B．painful
C．paining
D．pain
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