单项选择题

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

A. potential
B. pretended
C. preventive
D. pretective

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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

单项选择题

Some people are color-blinded and cannot()between blue and green.

A. distinguish
B. differ
C. separate
D. divide

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