Population experts say that by 2050 the world will have about 2 billion people aged over 60,____as today.A．as three timesB． three times as manyC． three times ma-高中英语-n多题

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Population experts say that by 2050 the world will have about 2 billion people aged over 60,____as today.

A．as three times	B． three times as many
C． three times many	D． three times many as

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