填空题

If the lid is______, the machine may not drain the water.

【参考答案】

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In order to drain the water, we should set the knob at______ position.
单项选择题
A．a food producerB．an English language teacherC．a nutrition professorD．an American Chinese
A．a food producer
B．an English language teacher
C．a nutrition professor
D．an American Chinese
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