单项选择题

A．New technology is being employed.
B．Advertisements are being widely used.
C．New designs are being adopted.
D．More synthetic materials are being introduced.
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单项选择题
A．Customer and assistant.B．Father and daughter.C．Dentist and patient.D．Teacher and student.
A．Customer and assistant.
B．Father and daughter.
C．Dentist and patient.
D．Teacher and student.
单项选择题
A．His telephone went out of order.B．The buyers had to leave soon.C．He began to work at 8a.m.D．He had made an appointment with her for 8a.m.
A．His telephone went out of order.
B．The buyers had to leave soon.
C．He began to work at 8a.m.
D．He had made an appointment with her for 8a.m.
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