somebody worked out the maths problem.改为否定句( ) ( ) out the maths problem.

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somebodyworkedoutthemathsproblem.改为否定句()()outthemathsproblem.somebodyworkedoutthemathsproblem.改为否定句(

somebody worked out the maths problem.改为否定句( ) ( ) out the maths problem.
somebody worked out the maths problem.改为否定句
( ) ( ) out the maths problem.

somebody worked out the maths problem.改为否定句( ) ( ) out the maths problem.
( Nobody ) (worked ) out the maths problem.