单项选择题

Everyone has a legal ______ to provide the tax office with details of their earnings.

A．oath
B．obligation
C．optimum
D．orientation
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单项选择题
A budget of five dollars a day is totally ______ for a trip round Europe.
A．inadequate
B．incapable
C．incompatible
D．invalid
单项选择题
Everyone approved of the scheme but when we asked for volunteers they all ______ .
A．hang about
B．hang on
C．hang back
D．hang up
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