Jack must be helping his grandma to water the flowers,______?A．is heB．isn’t he C
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Jack must be helping his grandma to water the flowers,______?| A．is he | B．isn’t he | C．must he | D．mustn’t he |
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答案
| B |
解析
| 考查反义疑问句。Must表推测时，反义疑问句要根据句子的实际意义进行反问，而不是根据前面出现的情态动词，句意：杰克肯定在帮助他的奶奶浇花，是不是？所以排除C,D；且前面句子是肯定，所以后面要用否定形式。所以选B。 |
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