单项选择题

A．Therefore
B．However
C．Otherwise
D．Although
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单项选择题
A．negativeB．definiteC．adequateD．infinite
A．negative
B．definite
C．adequate
D．infinite
单项选择题
A．responsibilityB．potentialC．possibilityD．opportunity
A．responsibility
B．potential
C．possibility
D．opportunity
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