单项选择题


A．take place
B．happen
C．exist
D．appear
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单项选择题
A．includeB．excludeC．concludeD．contain
A．include
B．exclude
C．conclude
D．contain
单项选择题
A．yetB．tooC．eitherD．already
A．yet
B．too
C．either
D．already
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