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Frank, Marcella. (). Modern english:a practical reference guide/ Marcella Frank . London: Prentice Hall.

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Frank, Marcella. Modern english:a practical reference guide/ Marcella Frank. London: Prentice Hall, . Text.

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Frank, Marcella. Modern english:a practical reference guide/ Marcella Frank. London: Prentice Hall, . Text.

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Frank, Marcella. Modern english:a practical reference guide/ Marcella Frank. London: Prentice Hall, . Print.