【题目】Helen often studies hard, _____ she? ( )
A.isB.doC.isn’tD.doesn’t
【答案】D
【解析】
句意：海伦经常学习很用功。不是吗？这是一个反义疑问句，前面是肯定，所以后面是否定，句子时态为一般现在时，句子中没有be动词，主语是三单，所以是doesn’t，故选D。
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