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
—Who are you going to have this letter______ for you？—My secretary.
A．type
B．typed
C．been typed
D．been typing
单项选择题
Britain has recently had a high level of unemployment and the same is true ______ many other countries.
A．at
B．from
C．of
D．to
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