单项选择题

Although he was ill, ______ he went on working.

A．but
B．yet
C．and
D．while
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单项选择题
--What did he just say--Nothing, he ______ to himself.
A．was just talking
B．just talked
C．has just talked
D．had just talked
单项选择题
--Who are you going to have this letter ______ for you--My secretary.
A．type
B．typed
C．been typed
D．been typing
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