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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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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