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．His telephone went out of order.B．The buyers had to leave soon.C．He began to work at 8 a.m.D．He had made an appointment with her for 8 a.m.
A．His telephone went out of order.
B．The buyers had to leave soon.
C．He began to work at 8 a.m.
D．He had made an appointment with her for 8 a.m.
填空题
B
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