单项选择题

You have to make sure that you have chosen a secure solution.

A. clear
B. secret
C. advisable
D. safe
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单项选择题
The boy is too young to discriminate right from wrong.
A. infer
B. access
C. distinguish
D. recognize
单项选择题
The son was so concerned about the illness of his father.
A. serious
B. happy
C. lucky
D. worded
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