单项选择题

A．It is difficult to identify.
B．It has been misplaced.
C．It is missing.
D．It has been borrowed by someone.
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单项选择题
A．He has got a bad cold.B．He has caught whooping cough.C．He has a fever and a bad appetite.D．He has been coughing for several days.
A．He has got a bad cold.
B．He has caught whooping cough.
C．He has a fever and a bad appetite.
D．He has been coughing for several days.
单项选择题
A．He was with a patient.B．He was away on vacation.C．He was talking to his secretary.D．He was operating.
A．He was with a patient.
B．He was away on vacation.
C．He was talking to his secretary.
D．He was operating.
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