单项选择题

A．vital
B．utmost
C．ultimate
D．chief
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单项选择题
A．good atB．poor inC．excel inD．indifferent to
A．good at
B．poor in
C．excel in
D．indifferent to
单项选择题
A．throughoutB．throughC．therebyD．during
A．throughout
B．through
C．thereby
D．during
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