Since then the number of people taking driving lessons______20%.A、has increased

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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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[originaltext]W:I’msorry,sir.Wouldyourepeatyourtelephonenumber?M:Yes