Since then the number of people taking driving lessons ________ 20％.
A．has increased to B．increases by C．has increased byD．have increased by
C
這題考查時態(tài)和介詞的用法：時間狀語是：since then，句子用現(xiàn)在完成時，increase by“增加了”，increase to增加到，句意是：自從那時起，上駕校的人的數(shù)量就增加了20%。選C。
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