There are altogether fifty-six students in our class, is a new er from a faraway mountain village.A.the most hard-working of whoB.of whom the most hard-workingC.the most hard-working of themD.but the most hard-working of whom
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B解析考察定语从句，题干中先行词fifty-six students，它在定语从句中的作用是表示范围的状语。