Tom’s teacher kept on telling him to practise speaking English, but _______ didn’t work.A.he B.whichC.allD.it
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D解析试题分析：but 后句子少主语，而主语恰巧是Tom’s teacher kept on telling him to practise speaking English这件事，it 可代替前一句。故选D考点：考察it的用法
点评：it词简单，可用法可不简单，平时学习要多注意it的用法