单项选择题

My mother has lived __ since my father died 20 years ago.

A．single
B．alone
C．sole
D．lonely
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As life is full of strife and __, we need friends to support and help us out of difficulties.
A．confirm
B．conflict
C．conformation
D．confinement
单项选择题
A complete refining installation must include all necessary__.
A．faculties
B．fragments
C．facilities
D． fairly
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