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Extra lessons on Sundays put ______ pressure on students, who already have ______ homework.

A. many; much of    B. more; many of   

C. more; piles of     D. many; plenty of

Extra lessons on Sundays put ______ pressure on students, who already have ______ homework.

A．many; much of       B．more; many of        C．more; piles of   D．many; plenty of