A、age〈19 and total〉285 and mark 1=100 or mark2=100 or mark 3=100
B、age〈19 and total〉285 or mark 1=100 or mark2=100 or mark 3=100
C、age〈19 and total〉285 and(mark1=100 or mark2=100 or mark 3=100)
D、(age〈19 or total〉285)and(mark1=100 o rmark2=100 or mark 3=100)
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