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【参考答案】

there fore改为however
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单项选择题
A．business associates.B．boss and secretary.C．teacher and student.D．good friends.
A．business associates.
B．boss and secretary.
C．teacher and student.
D．good friends.
单项选择题
A．typing.B．drawing a picture.C．doing exercise.D．playing the piano.
A．typing.
B．drawing a picture.
C．doing exercise.
D．playing the piano.
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