Since then the number of people taking driving lessons______20%.

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问题 Since then the number of people taking driving lessons______20%.

选项 A、has increased to
B、increased by
C、has increased by
D、have increased by

答案C

解析 本题考查语法。since表示一直持续的动作,所以应该用完成时态,故B不正确;主语the number是单数,谓语动词也应该用单数,故D不正确;表示上升或下降的比率一般用介词by,故选C。
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