单项选择题

There ______ little change in the patient's condition since he was taken to the hospital.

A．is
B．has been
C．have been
D．was
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单项选择题
Dr. Smith, together with his wife and two sons, ______ to arrive on the evening flight.
A．are
B．are going
C．is
D．will be
单项选择题
______such work before, she asked advice,from many experienced workers and planned everything carefully.
A．Having never done
B．Having been done
C．Having done
D．Never having done
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