单项选择题

He has lived here for years, ______ nobody knows what he is.

A．and but
B．though
C．and yet
D．for all that
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单项选择题
William has cut his smoking ______ to five cigarettes a day.
A．down
B．in
C．off
D．our
单项选择题
Professor Smith is always very ______ to the reaction of the audience when he gives lectures.
A．sentimental
B．sensitive
C．sensible
D．positive
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