We are tired of doing ________ homework every day; most of _______ is of no use but of mechanical drill.A.a lot of; itB.the number of; whichC.a number of; itD.a great deal of; which
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A解析本题考查修饰不可数名词的形容词短语，homework是不可数名词所以排除BC；句中分号说明第二句不是定语从句，用it 代替homework。