Ms.Chen thought that her idea for a new washing machine could be a profitable ________ .

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问题 Ms.Chen thought that her idea for a new washing machine could be a profitable ________ .

选项 A、invents   
B、invent
C、inventor
D、invention

答案D

解析 陈女士认为她关于新洗衣机的设想是一项利润较高的发明。空格前面有a,判断此处填入名词,排除A、B。“inventor”发明者,用于人;“invention”发明,因此选D。
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