单项选择题
A.where B.group by C.order by D.limit
A.source/etc/profile B./etc/profile C.sh/etc/profile D.sh-x/etc/profile
A.3306 B.6606 C.8066 D.9906
A.select max（score）fromt_score B.select min（score）fromt_score C.select avg（score）fromt_score D.select sum（score）fromt_score
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