单项选择题

—I really don't know how to thank you enough.
—______.

A．No problem
B．Think nothing of it
C．Not at all
D．It doesn't matter
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单项选择题
Although he was ill,______ he went on working.
A．but
B．yet
C．and
D．while
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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