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Paper produced every year is ________ the world's production of vehicles．

A．the three times weight of

B．three times the weight of

C．as three times heavy as

D．three times as heavier as

Paper produced every year is ________ the world's production of vehicles．

A．the three times weight of

B．three times the weight of

C．as three times heavy as

D．three times as heavier as

Paper produced every year is ________ the world’s production of vehicles．

A．the three times weight of

B．three times the weight of

C．as three times heavy as

D．three times heavy than

Paper produced every year is ________ the world's production of vehicles．

A．the three times weight of

B．three times the weight of

C．as three times heavy as

D．three times as heavier as

Paper produced every year is ________ the world's production of vehicles．

A．the three times weight of

B．three times the weight of

C．as three times heavy as

D．three times as heavier as

Paper produced every year is ________ the world’s production of vehicles．

A．three times the weight of

B．three times weight of

C．as three times as heavy

D．three times so heavy as