单项选择题

The safety rules are()anyone.

A. applied on 
B. applied in 
C. applied for 
D. applied to

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All the countries are customers or()customers of the United States.

A. potential  
B. pretended 
C. preventive 
D. pretective
单项选择题
We got to the station only()that the train had just left.

A. learned   
B. to learn 
C. learning 
D. having learned
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