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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单项选择题
Some people are color-blinded and cannot()between blue and green.

A. distinguish 
B. differ 
C. separate   
D. divide
单项选择题
______knows the name of this song will receive a prize from the radio station.
A．One
B．Who
C．Anyone
D．Whoever
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