单项选择题

Linton looked as though he ______ ill for a long time.

A．were
B．was
C．has been
D．had been
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单项选择题
To the list may ______ some other names.
A．be added
B．added be
C．add
D．add be
单项选择题
He was so absorbed ______ his work that he didn't notice me entering his mom.
A．at
B．on
C．for
D．in
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