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【参考答案】

friend→friends。
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单项选择题
A．It will be easy to understand.B．Students will be tested on all the material discussed in class.C．It will cover topics from a wide variety of academic fields.
A．It will be easy to understand.
B．Students will be tested on all the material discussed in class.
C．It will cover topics from a wide variety of academic fields.
填空题
baby前加a。
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