单项选择题

A．She regretted having bought the second -hand car.
B．It is unnecessary to rent another house.
C．They should sell their second - hand car and buy a new one.
D．They can afford a second - hand car.
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单项选择题
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单项选择题
It can be inferred from the passage that when a 7-month baby calls his or her mother mama ________.
A．he probably has known that mother should be called in this way
B．he probably does not know the sound Stands for "mother"
C．he probably has already known the meaning of mama
D．it is the first meaningful sound pronounced by him
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