单项选择题

A．facilitate
B．worry
C．trouble
D．bother
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单项选择题
A．HoweverB．FurtherC．InsteadD．Still
A．However
B．Further
C．Instead
D．Still
单项选择题
A．involvementB．operationC．examinationD．appointment
A．involvement
B．operation
C．examination
D．appointment
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