单项选择题

The reason he has been such a success ______ he never gives up.

A．is what
B．is that
C．is because
D．is
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单项选择题
A．nearlyB．naturallyC．officiallyD．socially
A．nearly
B．naturally
C．officially
D．socially
单项选择题
A．HoweverB．ThereforeC．For himD．Except for that
A．However
B．Therefore
C．For him
D．Except for that
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