题目

 The period ________ dance classes increases gradually from two or three     hours a day to five or six.     A．referred to       B．kept to        C．got to             D．given to 答案：D　given to dance classes为过去分词短语作后置定语，相当于that was given to dance classes, 意思是“分给舞蹈课的时间”。

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