—How______do you attend the evening classes?—______,three times per week.A.long;On the wholeB.often;On averageC.soon;Generally speakingD.much;In all
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B解析how often 指“频度”；how long指“时间段“；how soon指“要多久”。on the whole 从整体来说；on average 平均起来；generally speaking 总的来说；in all 总共。