The output of television sets has______in the past five years.

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问题 The output of television sets has______in the past five years.

选项 A、more than doubled
B、more than double
C、as many as double
D、as much as double

答案A

解析 这里的double是不及物动词,表示“增加一倍”(或“是原来的两倍”)。Has doubled“已增加了一倍”;has more than doubled“已增加了一倍多”。double还可以用作及物动词,如:I shall double your wages;还可用作形容词,如:I shall give you double pay;还可用作名词,如:She offered me double for it.
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