单项选择题

A．Because they did not eat other animals.
B．Because they were useful for protection.
C．Because they were good hunters.
D．Because they always obeyed their masters.
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单项选择题
A．Husband and wife.B．Father and daughter.C．Doctor and patient.D．Teacher and student.
A．Husband and wife.
B．Father and daughter.
C．Doctor 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 8 am.D．He had made an appointment with her for 8 am.
A．His telephone went out of order.
B．The buyers had to leave soon.
C．He began to work at 8 am.
D．He had made an appointment with her for 8 am.
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