By 2050 the world will have about 2 billion people aged over 60, three times ______ today.

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问题 By 2050 the world will have about 2 billion people aged over 60, three times ______ today.

选项 A、as much as
B、as that of
C、as many as
D、as those of

答案C

解析

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GCT工程硕士（英语）

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